RANKING · 1990 CENSUS · 500 SHOWN OF 3,122

Largest senior population, US counties · 1990

US counties home to the most residents aged 65 and over as of 1990. Ranked by number of people, not the senior share. Los Angeles County, California leads at 855,666. 3,122 counties qualify in total. New York carries 7 of the top 25 entries. The median across all 3,122 is 3,291.

All statesAll rankings

SAME RANKING BYCities States Metros

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Most unmarried people Most unmarried men

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPRESIDENTS 65 AND OVERVS –

USUnited States12.5% of US population248,709,87331,195,275–

01Los Angeles County, CACA9,694,934855,666–

02Cook County, ILIL5,194,625631,826–

03Kings County, NYNY2,653,963286,911–

04Queens County, NYNY2,358,182286,248–

05San Diego County, CACA3,282,248272,348–

06Maricopa County, AZAZ4,689,558264,650–

07Wayne County, MIMI1,769,038263,997–

08Broward County, FLFL2,013,317260,098–

09Philadelphia County, PAPA1,574,281241,206–

10Allegheny County, PAPA1,225,035232,505–

11Pinellas County, FLFL948,563221,564–

12Cuyahoga County, OHOH1,232,925220,659–

13Orange County, CACA3,149,507218,991–

14Palm Beach County, FLFL1,575,726210,389–

15New York County, NYNY1,664,862198,188–

16Harris County, TXTX5,045,026196,474–

17Nassau County, NYNY1,398,939182,605–

18Middlesex County, MAMA1,669,979175,234–

19King County, WAWA2,344,939167,328–

20Riverside County, CACA2,544,916153,890–

21Dallas County, TXTX2,661,397151,510–

22Erie County, NYNY946,741147,430–

23Suffolk County, NYNY1,546,090140,994–

24Bronx County, NYNY1,406,332139,484–

25Alameda County, CACA1,636,630135,285–

26Milwaukee County, WIWI924,216130,502–

27St. Louis County, MOMO990,911129,906–

28Santa Clara County, CACA1,914,391128,846–

29Westchester County, NYNY1,015,743126,268–

30Bergen County, NJNJ977,026126,229–

31San Bernardino County, CACA2,224,091123,838–

32Oakland County, MIMI1,288,337117,709–

33Hennepin County, MNMN1,284,784116,407–

34Bexar County, TXTX2,160,088116,073–

35Hamilton County, OHOH838,418115,000–

36Sacramento County, CACA1,618,460109,674–

37San Francisco County, CACA826,079105,263–

38Montgomery County, PAPA877,643101,976–

39Hillsborough County, FLFL1,574,115101,886–

40Baltimore, MDMD569,997100,575–

41Ocean County, NJNJ673,746100,389–

42Essex County, NJNJ896,37998,085–

43Worcester County, MAMA888,50297,287–

44Tarrant County, TXTX2,248,46697,139–

45Baltimore County, MDMD847,65096,863–

46Essex County, MAMA826,65394,436–

47Providence County, RIRI678,17994,252–

48Marion County, ININ992,19692,807–

49Franklin County, OHOH1,361,53692,485–

50Jefferson County, ALAL665,74291,748–

51Honolulu County, HIHI988,70391,485–

52Pima County, AZAZ1,074,68591,257–

53Pasco County, FLFL674,51690,757–

54Sarasota County, FLFL479,95889,484–

55Jefferson County, KYKY795,22289,367–

56Monroe County, NYNY750,50688,603–

57Macomb County, MIMI886,22188,476–

58Contra Costa County, CACA1,170,07087,459–

59Norfolk County, MAMA739,74986,455–

60Shelby County, TNTN910,22686,153–

61Delaware County, PAPA580,93784,713–

62Volusia County, FLFL606,57384,378–

63Lee County, FLFL875,60783,119–

64Jackson County, MOMO732,99482,631–

65Suffolk County, MAMA791,89180,633–

66San Mateo County, CACA743,56880,308–

67Multnomah County, OROR795,39179,158–

68Middlesex County, NJNJ883,33578,841–

69Clark County, NVNV2,407,22677,686–

70District of Columbia, DCDC693,64577,672–

71Montgomery County, MDMD1,074,58277,085–

72Polk County, FLFL874,79075,235–

73Union County, NJNJ601,86373,715–

74Bristol County, MAMA593,64073,367–

75Oklahoma County, OKOK822,12572,216–

76Montgomery County, OHOH539,59872,040–

77Duval County, FLFL1,062,96371,942–

78Orange County, FLFL1,528,00271,862–

79Summit County, OHOH538,37671,133–

80Monmouth County, NJNJ651,03570,472–

81Hudson County, NJNJ735,03370,014–

82Fresno County, CACA1,035,45668,311–

83DuPage County, ILIL934,29867,634–

84Hampden County, MAMA464,33867,483–

85Brevard County, FLFL663,98266,301–

86St. Louis, MOMO278,14466,254–

87Fulton County, GAGA1,098,79164,753–

88Luzerne County, PAPA332,12664,705–

89Orleans Parish, LALA362,15464,587–

90Denver County, COCO740,61364,152–

91Westmoreland County, PAPA349,32463,501–

92Ventura County, CACA830,85162,469–

93Pierce County, WAWA946,28861,247–

94Camden County, NJNJ535,79961,096–

95Salt Lake County, UTUT1,220,91661,079–

96Onondaga County, NYNY466,58460,479–

97Lucas County, OHOH423,34759,901–

98Ramsey County, MNMN541,62359,447–

99Manatee County, FLFL468,20059,360–

100Davidson County, TNTN745,90459,235–

101Bucks County, PAPA647,82858,784–

102Lake County, ININ504,61258,511–

103Tulsa County, OKOK698,78258,194–

104Passaic County, NJNJ531,62458,142–

105Lancaster County, PAPA563,15955,517–

106Kent County, MIMI675,23253,857–

107San Joaquin County, CACA823,81553,281–

108Stark County, OHOH373,77153,216–

109Fairfax County, VAVA1,167,87352,977–

110Berks County, PAPA440,07252,658–

111Kern County, CACA927,06852,642–

112Sonoma County, CACA486,44452,348–

113Bernalillo County, NMNM667,60150,379–

114Plymouth County, MAMA546,82950,278–

115New Castle County, DEDE588,02650,210–

116Prince George's County, MDMD970,37449,771–

117El Paso County, TXTX877,85848,033–

118Spokane County, WAWA558,34447,877–

119Mecklenburg County, NCNC1,233,38347,584–

120Douglas County, NENE606,46047,295–

121DeKalb County, GAGA774,39446,295–

122Sedgwick County, KSKS538,43346,097–

123Jefferson Parish, LALA431,39845,428–

124Santa Barbara County, CACA442,06545,093–

125Mahoning County, OHOH224,70645,045–

126Lehigh County, PAPA384,38344,878–

127York County, PAPA473,19744,513–

128Mobile County, ALAL411,65844,460–

129Snohomish County, WAWA870,65644,280–

130Morris County, NJNJ524,25144,156–

131Genesee County, MIMI401,09343,583–

132Lackawanna County, PAPA216,50243,193–

133Lake County, ILIL719,33943,153–

134Marion County, FLFL442,66043,114–

135Albany County, NYNY321,22542,828–

136Knox County, TNTN511,45342,672–

137Mercer County, NJNJ399,28942,559–

138Burlington County, NJNJ481,43942,016–

139Richmond County, NYNY501,29041,900–

140Lake County, FLFL456,06841,802–

141Travis County, TXTX1,389,67041,478–

142Barnstable County, MAMA233,53941,322–

143Guilford County, NCNC562,23441,321–

144Chester County, PAPA557,11640,769–

145Stanislaus County, CACA557,71940,253–

146Pulaski County, ARAR404,61140,093–

147Oneida County, NYNY226,39238,729–

148Hamilton County, TNTN390,83338,259–

149Hidalgo County, TXTX921,54938,194–

150Erie County, PAPA265,83238,017–

151Greenville County, SCSC583,12537,942–

152Charlotte County, FLFL217,21237,541–

153Polk County, IAIA516,54637,539–

154Anne Arundel County, MDMD603,38037,507–

155Lane County, OROR381,58437,090–

156Northampton County, PAPA324,41136,915–

157Washington County, PAPA210,80235,810–

158Jefferson County, COCO580,45135,637–

159St. Joseph County, ININ272,86134,866–

160East Baton Rouge Parish, LALA456,18034,792–

161Madison County, ILIL263,11034,693–

162Collier County, FLFL417,13134,556–

163Monterey County, CACA433,72934,514–

164Hillsborough County, NHNH433,41534,382–

165Allen County, ININ402,32934,260–

166Dauphin County, PAPA293,35133,983–

167Dane County, WIWI590,37533,767–

168St. Louis County, MNMN200,51833,496–

169Niagara County, NYNY208,91233,466–

170Jefferson County, TXTX254,32133,446–

171St. Clair County, ILIL250,70833,391–

172Johnson County, KSKS636,90633,359–

173Tulare County, CACA485,14633,337–

174Caddo Parish, LALA224,22633,061–

175Wake County, NCNC1,257,23532,951–

176Trumbull County, OHOH198,97232,898–

177Marion County, OROR355,77732,885–

178Kanawha County, WVWV172,38132,496–

179Atlantic County, NJNJ278,65732,490–

180Forsyth County, NCNC401,71832,399–

181Orange County, NYNY417,66932,152–

182Winnebago County, ILIL283,67432,081–

183Clackamas County, OROR426,28031,986–

184St. Lucie County, FLFL402,44931,862–

185Broome County, NYNY195,73631,776–

186Cumberland County, MEME317,22231,738–

187El Paso County, COCO757,04031,674–

188Beaver County, PAPA166,03231,563–

189Washington County, OROR611,70831,511–

190Escambia County, FLFL333,83431,498–

191Butte County, CACA209,21131,487–

192Lorain County, OHOH323,21931,267–

193Hernando County, FLFL221,70131,078–

194Richmond, VAVA237,25731,059–

195San Luis Obispo County, CACA282,36730,612–

196Schuylkill County, PAPA145,08530,562–

197Cambria County, PAPA128,96830,552–

198Will County, ILIL712,25330,538–

199Waukesha County, WIWI417,21029,994–

200Seminole County, FLFL491,88429,912–

201Charleston County, SCSC436,20029,833–

202Butler County, OHOH400,12829,744–

203Dutchess County, NYNY300,70829,685–

204Kane County, ILIL525,75729,407–

205Citrus County, FLFL171,66629,339–

206Nueces County, TXTX352,99229,063–

207Arapahoe County, COCO673,82029,033–

208Spartanburg County, SCSC380,85728,688–

209Hinds County, MSMS211,88828,521–

210Buncombe County, NCNC277,41728,329–

211Cobb County, GAGA793,34528,287–

212Marin County, CACA253,69428,221–

213Solano County, CACA455,37627,879–

214Greene County, MOMO309,28627,829–

215Martin County, FLFL166,27227,716–

216Chatham County, GAGA311,85527,632–

217Norfolk, VAVA231,01327,333–

218Cameron County, TXTX433,94627,331–

219Henrico County, VAVA342,77526,962–

220Rockland County, NYNY357,39726,911–

221Richland County, SCSC434,95626,646–

222Fayette County, PAPA123,02126,169–

223Cumberland County, PAPA277,27026,128–

224Santa Cruz County, CACA258,85226,090–

225Washoe County, NVNV509,38625,924–

226Peoria County, ILIL178,55325,922–

227Somerset County, NJNJ356,48625,920–

228Vanderburgh County, ININ181,99525,904–

229Lake County, OHOH232,21725,830–

230Saginaw County, MIMI187,68825,575–

231Yavapai County, AZAZ252,55225,517–

232Clark County, WAWA532,11925,433–

233McLennan County, TXTX272,02025,386–

234Gloucester County, NJNJ312,63824,712–

235Schenectady County, NYNY162,58124,703–

236Indian River County, FLFL172,79924,591–

237Yakima County, WAWA259,18524,471–

238Sangamon County, ILIL194,17024,443–

239Ingham County, MIMI289,70924,435–

240Montgomery County, ALAL225,89124,299–

241Kent County, RIRI173,49524,229–

242Jackson County, OROR221,79523,700–

243Kalamazoo County, MIMI263,79523,665–

244Berkshire County, MAMA128,22423,539–

245Lancaster County, NENE334,04923,332–

246Virginia Beach, VAVA453,73723,106–

247Highlands County, FLFL111,12222,835–

248Galveston County, TXTX372,20722,716–

249Rockingham County, NHNH324,07722,625–

250Rock Island County, ILIL141,86922,316–

251Fayette County, KYKY329,75122,303–

252Chautauqua County, NYNY124,12622,273–

253Berrien County, MIMI152,44422,187–

254Blair County, PAPA119,54122,179–

255Lubbock County, TXTX328,90621,616–

256Ulster County, NYNY183,33021,561–

257Madison County, ALAL433,51621,437–

258Ada County, IDID546,14121,419–

259Washtenaw County, MIMI370,21421,266–

260Gaston County, NCNC246,55821,094–

261Brown County, WIWI275,80321,080–

262Shawnee County, KSKS178,60721,068–

263Racine County, WIWI198,91921,002–

264Wyandotte County, KSKS170,59720,916–

265York County, MEME222,43420,801–

266Mercer County, PAPA107,86020,771–

267Shasta County, CACA181,64820,765–

268Muskegon County, MIMI177,90120,761–

269Smith County, TXTX252,54920,663–

270Linn County, IAIA232,02820,526–

271Rensselaer County, NYNY160,51020,523–

272Sullivan County, TNTN163,75920,505–

273Butler County, PAPA200,16920,480–

274Placer County, CACA442,08120,454–

275Clark County, OHOH135,34020,386–

276Kitsap County, WAWA283,37420,284–

277Adams County, COCO554,66820,161–

278Anderson County, SCSC219,93019,961–

279Mohave County, AZAZ228,10219,479–

280Durham County, NCNC347,24019,410–

281Arlington County, VAVA243,93119,366–

282Muscogee County, GAGA202,17119,323–

283Bibb County, GAGA157,55619,289–

284Cape May County, NJNJ93,39019,151–

285Sussex County, DEDE277,14018,965–

286Richmond County, GAGA206,55918,929–

287Thurston County, WAWA304,26118,799–

288Saratoga County, NYNY241,34318,705–

289Cumberland County, NJNJ157,14818,662–

290Pueblo County, COCO169,27718,568–

291LaSalle County, ILIL107,77318,513–

292Jackson County, MIMI159,55218,505–

293Utah County, UTUT759,85918,429–

294Ottawa County, MIMI308,45918,346–

295Madison County, ININ135,08818,301–

296Napa County, CACA132,94918,291–

297Northumberland County, PAPA89,92018,287–

298Horry County, SCSC427,55118,262–

299Calhoun County, MIMI133,40818,129–

300Calcasieu Parish, LALA208,46618,083–

301Winnebago County, WIWI174,21817,999–

302Lycoming County, PAPA112,58717,963–

303Harrison County, MSMS217,13617,958–

304Larimer County, COCO377,29217,939–

305St. Clair County, MIMI160,48617,922–

306Lawrence County, PAPA83,91117,807–

307Weber County, UTUT278,17417,627–

308Rock County, WIWI166,47217,620–

309Franklin County, PAPA160,65217,538–

310Elkhart County, ININ208,77417,482–

311Benton County, ARAR332,55417,455–

312McHenry County, ILIL317,75117,361–

313Dakota County, MNMN457,71017,352–

314Scott County, IAIA175,25917,298–

315Tuscaloosa County, ALAL241,36817,101–

316Boulder County, COCO328,56017,048–

317Macon County, ILIL99,30017,009–

318Hampshire County, MAMA164,06516,982–

319Bell County, TXTX402,24816,960–

320Penobscot County, MEME157,96716,946–

321Black Hawk County, IAIA131,53216,889–

322Washington County, MDMD157,73116,818–

323Rowan County, NCNC155,09616,800–

324Alachua County, FLFL290,02816,765–

325Lebanon County, PAPA146,38016,749–

326Cumberland County, NCNC338,47316,657–

327Gwinnett County, GAGA1,018,09916,620–

328Roanoke, VAVA99,11116,471–

329Richland County, OHOH124,89316,377–

330Tazewell County, ILIL130,04916,371–

331Merced County, CACA297,26016,337–

332Kenton County, KYKY175,77916,323–

333Whatcom County, WAWA236,39216,225–

334Garland County, ARAR99,69516,220–

335Kenosha County, WIWI168,44816,180–

336Columbiana County, OHOH99,37716,077–

337Ouachita Parish, LALA158,54216,068–

338Vigo County, ININ106,51215,988–

339Cabell County, WVWV91,18315,887–

340Etowah County, ALAL103,88615,872–

341Clay County, MOMO265,03215,865–

342Newport News, VAVA183,23015,854–

343Alamance County, NCNC186,17715,852–

344Montgomery County, TXTX781,19415,846–

345Rapides Parish, LALA125,87715,770–

346Pinal County, AZAZ539,38015,731–

347Leon County, FLFL299,04815,716–

348Outagamie County, WIWI195,89415,684–

349Grayson County, TXTX153,61315,617–

350Kennebec County, MEME129,06715,541–

351Wichita County, TXTX129,55515,530–

352El Dorado County, CACA192,32315,353–

353Bay County, FLFL204,47915,258–

354Licking County, OHOH185,56415,227–

355Davidson County, NCNC180,18215,206–

356Sheboygan County, WIWI118,04715,134–

357Henderson County, NCNC122,37515,116–

358Delaware County, ININ113,10615,114–

359Harford County, MDMD266,44615,107–

360Champaign County, ILIL209,97215,091–

361Hawaii County, HIHI210,04315,073–

362New Hanover County, NCNC245,95915,066–

363Osceola County, FLFL481,71815,042–

364Baldwin County, ALAL267,76114,930–

365Bay County, MIMI102,12314,927–

366Lexington County, SCSC317,58814,858–

367Brazoria County, TXTX419,08014,779–

368St. Charles County, MOMO426,49914,687–

369Humboldt County, CACA131,64714,685–

370Yuma County, AZAZ224,44914,671–

371Allen County, OHOH100,88114,665–

372Ashtabula County, OHOH96,71314,661–

373Marathon County, WIWI139,43214,596–

374Merrimack County, NHNH158,07814,577–

375Douglas County, OROR111,95114,533–

376Woodbury County, IAIA106,64914,476–

377Steuben County, NYNY91,85514,421–

378Calhoun County, ALAL115,83414,386–

379Minnehaha County, SDSD212,69114,380–

380Chemung County, NYNY80,41514,309–

381Nevada County, CACA101,91114,281–

382Taylor County, TXTX150,07714,272–

383Jefferson County, MOMO233,13214,242–

384Portsmouth, VAVA96,77714,219–

385Frederick County, MDMD302,88314,180–

386Catawba County, NCNC170,17214,154–

387Androscoggin County, MEME116,48714,121–

388Jasper County, MOMO127,42814,079–

389Yellowstone County, MTMT172,69213,999–

390York County, SCSC306,88713,993–

391Vermilion County, ILIL71,25913,986–

392LaPorte County, ININ111,29413,953–

393Allegany County, MDMD66,84813,906–

394Gregg County, TXTX126,09513,895–

395Sebastian County, ARAR130,64113,891–

396St. Johns County, FLFL346,32813,824–

397Jefferson County, OHOH63,59713,814–

398Monroe County, MIMI156,00413,797–

399Aiken County, SCSC181,51513,767–

400Denton County, TXTX1,069,34613,694–

401Lafayette Parish, LALA257,94913,639–

402Collin County, TXTX1,297,17913,615–

403Buchanan County, MOMO83,54013,609–

404St. Lawrence County, NYNY105,48813,548–

405Washington County, RIRI129,79513,527–

406Anoka County, MNMN381,60513,510–

407McLean County, ILIL171,41913,474–

408Yolo County, CACA224,41013,438–

409Linn County, OROR132,84313,429–

410Mesa County, COCO162,84513,408–

411Greene County, OHOH174,32213,375–

412Portage County, OHOH163,40413,330–

413Crawford County, PAPA81,79213,314–

414Okaloosa County, FLFL221,81013,304–

415Weld County, COCO378,42613,285–

416Somerset County, PAPA72,00413,252–

417Belmont County, OHOH64,43413,209–

418Kankakee County, ILIL105,52513,204–

419Oswego County, NYNY118,56913,111–

420Clermont County, OHOH216,97713,030–

421Clearfield County, PAPA78,10012,987–

422Cabarrus County, NCNC249,72512,986–

423Washington County, TNTN141,19912,902–

424Armstrong County, PAPA63,69812,896–

425St. Tammany Parish, LALA279,10812,887–

426Wood County, WVWV82,38512,858–

427Potter County, TXTX114,45312,835–

428Josephine County, OROR87,86712,833–

429Chesterfield County, VAVA397,14812,818–

430Cochise County, AZAZ126,33212,815–

431Randolph County, NCNC149,51612,803–

432Manitowoc County, WIWI81,71012,789–

433Chesapeake, VAVA255,33212,773–

434Washington County, ARAR271,21312,772–

435Hampton, VAVA137,31512,734–

436Florence County, SCSC138,50412,719–

437Porter County, ININ176,04912,693–

438Fond du Lac County, WIWI104,66912,656–

439Blount County, TNTN143,82012,606–

440Carroll County, MDMD176,67712,584–

441La Crosse County, WIWI121,33912,532–

442Monroe County, PAPA167,17912,514–

443Tom Green County, TXTX120,60212,508–

444Tuscarawas County, OHOH92,37312,499–

445Skagit County, WAWA132,97512,494–

446Ontario County, NYNY113,13012,477–

447Stearns County, MNMN164,11012,435–

448Indiana County, PAPA82,87812,394–

449Rockingham County, NCNC94,19512,332–

450Monroe County, FLFL80,40612,299–

451Canyon County, IDID275,12312,292–

452Tippecanoe County, ININ190,45612,275–

453Moore County, NCNC110,61912,268–

454Harrison County, WVWV64,22112,263–

455Iredell County, NCNC211,79812,214–

456Jefferson County, NYNY111,54012,151–

457Warren County, NJNJ112,95312,145–

458Dubuque County, IAIA99,38112,143–

459Doña Ana County, NMNM229,09112,024–

460Scioto County, OHOH71,36511,929–

461Floyd County, GAGA101,37811,871–

462Medina County, OHOH185,02511,833–

463Cattaraugus County, NYNY75,39011,819–

464Raleigh County, WVWV71,77511,769–

465Miami County, OHOH112,63411,764–

466Adams County, ILIL64,26711,758–

467Wayne County, OHOH116,75811,752–

468Bowie County, TXTX92,69611,707–

469Sussex County, NJNJ148,06311,680–

470Morgan County, ALAL126,48311,676–

471Fairfield County, OHOH169,75211,646–

472Cleveland County, OKOK303,97311,646–

473Putnam County, FLFL77,73411,635–

474Cayuga County, NYNY74,36511,630–

475Davis County, UTUT381,22711,535–

476Clallam County, WAWA78,20211,528–

477Lake County, CACA67,77211,519–

478Jefferson County, ARAR62,98711,495–

479Kent County, DEDE194,78611,495–

480Cleveland County, NCNC103,32511,489–

481Wood County, OHOH134,17611,485–

482Dodge County, WIWI89,09711,406–

483Benton County, WAWA221,72211,399–

484Alexandria, VAVA160,66211,389–

485Howard County, MDMD339,18311,347–

486Maui County, HIHI160,59211,344–

487Muskingum County, OHOH87,01411,327–

488Lauderdale County, ALAL97,13511,323–

489Newport County, RIRI83,05111,294–

490Henderson County, TXTX88,59511,232–

491Robeson County, NCNC119,94111,207–

492Daviess County, KYKY104,89811,192–

493Aroostook County, MEME66,60911,117–

494Centre County, PAPA157,39311,114–

495Imperial County, CACA181,41111,111–

496Cowlitz County, WAWA114,88511,099–

497Strafford County, NHNH135,04311,074–

498Herkimer County, NYNY59,21911,069–

499Lenawee County, MIMI97,77911,060–

500Pottawattamie County, IAIA92,99611,055–

SHOWING 1–500 OF 3,122

Download CSV (full list, 3,122 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS

Frequently asked

Which county has the highest residents 65 and over?

Los Angeles County, California ranks #1 with 855,666 (1990 Decennial Census).

What are the top 5 counties by residents 65 and over?

Los Angeles County, California, Cook County, Illinois, Kings County, New York, Queens County, New York, San Diego County, California.

How many counties are in this ranking?

3,122 counties qualify after filtering for population minimums and data availability. The ranking covers 1990 Decennial Census data.

How is residents 65 and over measured?

Number of residents aged 65 and over, summed from the harmonized age bands (65-74, 75-84, 85+). Source: US Census Bureau, 1990 Decennial Census.