RANKING · 2010 CENSUS · 500 SHOWN OF 3,108

Oldest housing stock, US counties · 2010

US counties ranked by oldest median year of construction (2010 ACS). Antelope County, Nebraska leads at 1940. 3,108 counties qualify in total. Nebraska carries 8 of the top 25 entries.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2010 2020 2024

RANKPLACESTATEPOPMEDIAN YEAR BUILTVS 1990

USUnited States308,745,5381974–

01Antelope County, NENE6,3521940+0%

02Schuylkill County, PAPA145,0851940+0%

03Adams County, IAIA3,6171940+0%

04Furnas County, NENE4,5241941+0%

05Jefferson County, NENE7,0701941+0%

06Republic County, KSKS4,6401941+0%

07Boone County, NENE5,3551942+0%

08Sherman County, NENE2,9241942+0%

09Montgomery County, NYNY50,0461942+0%

10Jerauld County, SDSD1,6541942+0%

11Kalawao County, HIHI821942+0%

12Elk County, KSKS2,4581942+0%

13Rawlins County, KSKS2,4311942+0%

14Decatur County, KSKS2,7161943−0%

15Hitchcock County, NENE2,4671943+0%

16Kingsbury County, SDSD5,2841943+0%

17Turner County, SDSD9,3141943+0%

18Osborne County, KSKS3,2851943+0%

19Sedgwick County, COCO2,2471943+0%

20Montgomery County, IAIA10,0021943+0%

21Chautauqua County, KSKS3,3211943+0%

22Garfield County, WAWA2,4161943+0%

23Garden County, NENE1,8041944+0%

24Johnson County, NENE5,2181944+0%

25New York County, NYNY1,664,8621944+0%

26Northumberland County, PAPA89,9201944+0%

27Aurora County, SDSD2,8011944+0%

28Comanche County, KSKS1,6731944+0%

29Burt County, NENE6,6781944+0%

30Houghton County, MIMI37,8421945+0%

31Deuel County, NENE1,8621945+0%

32Nemaha County, NENE7,1021945+0%

33Chautauqua County, NYNY124,1261945+0%

34Clark County, SDSD4,0311945+0%

35Richardson County, NENE7,5301945+0%

36Fayette County, IAIA19,0471945+0%

37Franklin County, IAIA9,8681945+0%

38Edwards County, KSKS2,6401945+0%

39Nance County, NENE3,2901945+0%

40Baltimore, MDMD569,9971946+0%

41Wheatland County, MTMT2,1001946+0%

42Boyd County, NENE1,6741946+0%

43Cuming County, NENE8,8231946+0%

44Thayer County, NENE4,8421946+0%

45Lackawanna County, PAPA216,5021946+0%

46Highland County, VAVA2,3181946−1%

47Marshall County, KSKS9,8521946+0%

48Smith County, KSKS3,5661946+0%

49Philadelphia County, PAPA1,574,2811946+0%

50Deer Lodge County, MTMT9,7091947+0%

51Custer County, NENE10,5001947+0%

52Hanson County, SDSD3,4561947+0%

53Motley County, TXTX1,0431947−0%

54Sheridan County, NENE4,8091947−0%

55Chase County, KSKS2,5721947+0%

56Norton County, KSKS5,2881947+0%

57Wyoming County, NYNY39,7411947+0%

58Eddy County, NDND2,3291948−0%

59Frontier County, NENE2,6551948+0%

60McPherson County, SDSD2,3471948−0%

61Niobrara County, WYWY2,3411948−0%

62Crowley County, COCO5,6771948+0%

63Audubon County, IAIA5,5091948+0%

64Ida County, IAIA6,7771948+0%

65Monona County, IAIA8,5391948+0%

66Pocahontas County, IAIA6,8191948+0%

67Sac County, IAIA9,5251948+0%

68Griggs County, NDND2,2391949−0%

69Fillmore County, MNMN21,5401949+1%

70Lac qui Parle County, MNMN6,7041949+1%

71Clay County, NENE6,1701949+1%

72Keya Paha County, NENE7921949+0%

73Orleans County, NYNY39,8251949+1%

74McKean County, PAPA38,9841949+0%

75Providence County, RIRI678,1791949−0%

76Ottawa County, KSKS5,7441949+1%

77Greenwood County, KSKS5,8261949+0%

78Golden Valley County, NDND1,8081949−0%

79Cass County, IAIA12,9601949+0%

80Osceola County, IAIA5,9801949+0%

81Page County, IAIA14,8561949+0%

82Worth County, IAIA7,3381949+0%

83Cheyenne County, KSKS2,6041949+0%

84Rice County, KSKS9,2661949+0%

85Luzerne County, PAPA332,1261949+0%

86Perkins County, NENE2,8491950+0%

87Gogebic County, MIMI14,2851950+0%

88Faribault County, MNMN13,8881950+0%

89Prairie County, MTMT1,1121950+0%

90Silver Bow County, MTMT36,1181950+0%

91Arthur County, NENE3961950+0%

92Grant County, NENE5611950+0%

93Sioux County, NENE1,1881950+1%

94Queens County, NYNY2,358,1821950+0%

95Schenectady County, NYNY162,5811950+0%

96Faulk County, SDSD2,1781950+1%

97Moody County, SDSD6,6321950+0%

98Ohio County, WVWV40,4961950+0%

99Mitchell County, IAIA10,6501950+0%

100District of Columbia, DCDC693,6451950+0%

101Bureau County, ILIL32,5101950+1%

102Clinton County, ININ33,3221950+0%

103Howard County, IAIA9,4151950+0%

104Tama County, IAIA16,7961950+1%

105Harper County, KSKS5,3701950+0%

106Rush County, KSKS2,8451950+0%

107Chemung County, NYNY80,4151951+0%

108Dundy County, NENE1,5681951+0%

109Fillmore County, NENE5,4581951+0%

110Harding County, NMNM6171951+0%

111Bronx County, NYNY1,406,3321951−0%

112Fulton County, NYNY52,2161951+1%

113Nelson County, NDND2,9631951+0%

114Sheridan County, NDND1,2961951+1%

115Cambria County, PAPA128,9681951+0%

116Bon Homme County, SDSD7,2441951+0%

117Douglas County, SDSD2,8881951+1%

118Cottle County, TXTX1,2241951−0%

119McDowell County, WVWV16,8781951−0%

120Lafayette County, WIWI17,4781951+0%

121Hudson County, NJNJ735,0331951+1%

122Bent County, COCO5,7161951+0%

123Warren County, ILIL16,2221951+0%

124Benton County, ININ8,8831951+0%

125Cass County, ININ37,8361951+0%

126Rush County, ININ16,7671951+1%

127Butler County, IAIA14,0491951+0%

128O'Brien County, IAIA14,2201951+0%

129Shelby County, IAIA11,6891951+0%

130Wapello County, IAIA35,2101951+0%

131Cloud County, KSKS8,8331951+0%

132Ellsworth County, KSKS6,2571951+1%

133Kingman County, KSKS7,0291951+0%

134Mitchell County, KSKS5,5901951+1%

135Ness County, KSKS2,6171951+0%

136Berkshire County, MAMA128,2241952+0%

137Traverse County, MNMN3,1301952+1%

138Holt County, MOMO4,2001952−0%

139Banner County, NENE6861952+1%

140Cedar County, NENE8,3731952+1%

141Logan County, NENE6691952+1%

142Wheeler County, NENE7891952−0%

143Cayuga County, NYNY74,3651952+1%

144Cortland County, NYNY45,8501952+0%

145Seneca County, OHOH54,5221952+0%

146Campbell County, SDSD1,3771952+1%

147Throckmorton County, TXTX1,5541952−0%

148Covington, VAVA5,6801952+0%

149Greene County, IAIA8,6581952+1%

150Ford County, ILIL13,2161952+0%

151Jay County, ININ20,1181952+0%

152Boone County, IAIA26,7991952+0%

153Clayton County, IAIA16,8451952+1%

154Emmet County, IAIA9,1071952+0%

155Harrison County, IAIA14,6231952+1%

156Palo Alto County, IAIA8,8991952+0%

157Rooks County, KSKS4,6461952+0%

158Russell County, KSKS6,5811952+0%

159Sheridan County, KSKS2,4271952−0%

160Wayne County, NENE10,0201952+1%

161Herkimer County, NYNY59,2191952+1%

162Union County, IAIA11,8291953+0%

163Keweenaw County, MIMI2,1861953+1%

164Jackson County, MNMN9,8571953+0%

165Lincoln County, MNMN5,5831953+0%

166Pipestone County, MNMN9,2601953+0%

167Yellow Medicine County, MNMN9,4771953+0%

168Atchison County, MOMO5,1751953+0%

169Fergus County, MTMT11,8251953+0%

170Garfield County, NENE1,7101953+1%

171Erie County, NYNY946,7411953+0%

172Genesee County, NYNY58,4161953+0%

173Oneida County, NYNY226,3921953+0%

174McHenry County, NDND5,1301953+0%

175Steele County, NDND1,7971953+0%

176Crawford County, OHOH41,8961953−0%

177Alfalfa County, OKOK5,6491953+0%

178Venango County, PAPA49,3461953+0%

179Hutchinson County, SDSD7,4131953+0%

180Mason County, TXTX3,9901953+0%

181Van Wert County, OHOH29,0131953+0%

182Des Moines County, IAIA38,0771953+0%

183Cass County, ILIL12,4631953+0%

184Randolph County, ININ24,4381953+0%

185Calhoun County, IAIA9,5621953+0%

186Cherokee County, IAIA11,3691953+0%

187Fremont County, IAIA6,5221953+0%

188Hamilton County, IAIA14,9441953+0%

189Hardin County, IAIA16,4551953+0%

190Wright County, IAIA12,8011953+0%

191Hodgeman County, KSKS1,6191953+0%

192Pawnee County, KSKS5,9911953+0%

193Phillips County, KSKS4,7281953+0%

194Foard County, TXTX1,0441953+0%

195Wayne County, MIMI1,769,0381954+0%

196Carroll County, ILIL15,4191954+1%

197Cottonwood County, MNMN11,4051954+0%

198Martin County, MNMN19,4401954+0%

199Mower County, MNMN40,9711954+0%

200Murray County, MNMN7,9421954+0%

201Kimball County, NENE3,3911954+0%

202Valley County, NENE4,0941954+1%

203Essex County, NJNJ896,3791954+0%

204Passaic County, NJNJ531,6241954+0%

205Niagara County, NYNY208,9121954+0%

206Adams County, NDND2,2751954−0%

207Cuyahoga County, OHOH1,232,9251954+0%

208Allegheny County, PAPA1,225,0351954+0%

209Armstrong County, PAPA63,6981954+0%

210Blair County, PAPA119,5411954+0%

211Day County, SDSD5,4841954+0%

212Hall County, TXTX2,7371954+0%

213Barber County, KSKS4,0831954+0%

214Polk County, NENE5,2701954+1%

215Nassau County, NYNY1,398,9391954+0%

216Decatur County, IAIA7,6551954+0%

217Richmond, VAVA237,2571954+0%

218Lawrence County, PAPA83,9111954+0%

219Shoshone County, IDID14,1301954+0%

220Fulton County, ILIL32,9011954+0%

221Hancock County, ILIL16,8031954+0%

222Mercer County, ILIL15,2291954+0%

223Vermillion County, ININ15,4881954+1%

224Buena Vista County, IAIA20,4491954+0%

225Clinton County, IAIA46,0021954+0%

226Floyd County, IAIA14,9011954+0%

227Kossuth County, IAIA14,3221954+0%

228Lucas County, IAIA8,8471954+0%

229Dickinson County, KSKS18,6371954+0%

230Graham County, KSKS2,3711954+0%

231Montgomery County, KSKS30,1771954+0%

232Lexington, VAVA7,7691954+0%

233Fayette County, PAPA123,0211954+0%

234Milwaukee County, WIWI924,2161954+0%

235Orleans Parish, LALA362,1541955+0%

236Essex County, MAMA826,6531955+0%

237Hampden County, MAMA464,3381955+0%

238Middlesex County, MAMA1,669,9791955+0%

239Iron County, MIMI11,7571955+0%

240Grant County, MNMN6,0851955+0%

241Redwood County, MNMN15,2651955+0%

242Renville County, MNMN14,3561955+0%

243Rock County, MNMN9,5241955+0%

244Sibley County, MNMN15,3561955+0%

245Watonwan County, MNMN11,4591955+0%

246Union County, NJNJ601,8631955+0%

247Broome County, NYNY195,7361955+0%

248Essex County, NYNY36,4381955+0%

249Otsego County, NYNY60,5891955+1%

250Rensselaer County, NYNY160,5101955+0%

251Hettinger County, NDND2,4921955+0%

252Harrison County, OHOH14,0701955+0%

253Delaware County, PAPA580,9371955+0%

254Greene County, PAPA33,8851955+0%

255Gregory County, SDSD4,0371955+0%

256McCook County, SDSD5,9641955+1%

257Spink County, SDSD6,1551955+1%

258Briscoe County, TXTX1,4741955−0%

259McIntosh County, NDND2,4511955+0%

260Judith Basin County, MTMT2,1621955+0%

261Kiowa County, COCO1,4121955+0%

262Otero County, COCO17,6831955+0%

263Edgar County, ILIL16,3231955+0%

264Greene County, ILIL11,3131955+0%

265Knox County, ILIL47,7671955+0%

266Lee County, ILIL32,9141955+0%

267Cedar County, IAIA18,3591955+0%

268Grundy County, IAIA12,3611955+0%

269Humboldt County, IAIA9,4091955+0%

270Lee County, IAIA32,3061955+0%

271Webster County, IAIA36,8381955+0%

272Brown County, KSKS9,1041955+1%

273Clark County, KSKS1,9001955+1%

274Gove County, KSKS2,6311955+0%

275Pratt County, KSKS9,1171955+0%

276Trego County, KSKS2,7401955+0%

277Wilson County, KSKS8,2991955+0%

278Woodson County, KSKS3,1181955+1%

279Allegany County, MDMD66,8481955+0%

280Morrill County, NENE4,4041955+1%

281Westchester County, NYNY1,015,7431955+0%

282Greer County, OKOK5,3731955−0%

283Jefferson County, PAPA43,2551955+0%

284Floyd County, TXTX4,8811955−0%

285Franklin County, MAMA70,6981956+0%

286Big Stone County, MNMN5,0541956+1%

287Chippewa County, MNMN12,4061956+0%

288Freeborn County, MNMN30,4401956+0%

289Chouteau County, MTMT5,8651956+0%

290Daniels County, MTMT1,6121956+1%

291Wibaux County, MTMT8851956+0%

292Albany County, NYNY321,2251956+0%

293Cattaraugus County, NYNY75,3901956+0%

294Seneca County, NYNY32,8831956+0%

295Steuben County, NYNY91,8551956+0%

296Pierce County, NDND3,8381956−0%

297Belmont County, OHOH64,4341956+0%

298Harmon County, OKOK2,3271956+0%

299Beaver County, PAPA166,0321956+0%

300Bristol County, RIRI50,0011956+0%

301Beadle County, SDSD19,6241956+0%

302Hand County, SDSD3,1211956+1%

303Hyde County, SDSD1,1911956+1%

304Menard County, TXTX1,9561956+0%

305Red Willow County, NENE10,3071956+0%

306Tipton County, ININ15,3191956+0%

307Las Animas County, COCO14,3911956+1%

308Phillips County, COCO4,4201956−0%

309Washington County, COCO4,7321956+0%

310Iroquois County, ILIL26,1501956+0%

311Logan County, ILIL27,1821956+0%

312Vermilion County, ILIL71,2591956+0%

313Knox County, ININ35,6521956+0%

314Wayne County, ININ66,1691956+0%

315Appanoose County, IAIA12,0771956−0%

316Cerro Gordo County, IAIA42,3721956+0%

317Chickasaw County, IAIA11,6631956+0%

318Marshall County, IAIA39,8901956+0%

319Winneshiek County, IAIA19,7331956+1%

320Woodbury County, IAIA106,6491956+0%

321Bourbon County, KSKS14,3191956+0%

322Clay County, KSKS7,9901956+1%

323Cowley County, KSKS34,3821956+0%

324Marion County, KSKS11,6341956+0%

325Meade County, KSKS3,8521956+0%

326Nemaha County, KSKS10,0541956+1%

327Neosho County, KSKS15,6371956+0%

328Sumner County, KSKS22,3121956+0%

329McPherson County, NENE3691956−0%

330Lycoming County, PAPA112,5871956+0%

331Cook County, ILIL5,194,6251957+0%

332Kittson County, MNMN4,0311957+0%

333McCone County, MTMT1,7201957−0%

334Phelps County, NENE8,9941957+0%

335Saline County, NENE14,9961957+0%

336Bergen County, NJNJ977,0261957+0%

337De Baca County, NMNM1,6471957+0%

338Burke County, NDND2,1321957+1%

339Towner County, NDND2,0401957−0%

340Darke County, OHOH51,5201957+0%

341Hardin County, OHOH30,0721957+0%

342Sandusky County, OHOH58,6551957+0%

343Wyandot County, OHOH21,5671957+1%

344Elk County, PAPA29,9261957+0%

345Warren County, PAPA37,0381957+0%

346Edmunds County, SDSD4,0221957+0%

347Walworth County, SDSD5,2171957+0%

348Dallam County, TXTX7,5081957−0%

349Edwards County, TXTX1,3701957−0%

350Gray County, TXTX20,9191957+0%

351Kent County, TXTX6741957−0%

352Crawford County, ILIL18,6481957+0%

353Grant County, OKOK4,0671957+0%

354Wabash County, ININ30,7131957+0%

355Pierce County, NENE7,3781957+1%

356Merrick County, NENE7,9051957+1%

357Christian County, ILIL33,4431957+0%

358De Witt County, ILIL15,1181957+0%

359Pike County, ILIL14,2311957+0%

360Stephenson County, ILIL43,2201957+0%

361Henry County, ININ49,1371957+0%

362Huntington County, ININ37,2241957+1%

363Adair County, IAIA7,4031957+1%

364Crawford County, IAIA16,2371957+0%

365Hancock County, IAIA10,5281957+0%

366Lyon County, IAIA12,3541957+1%

367Wayne County, IAIA6,7381957+1%

368Barton County, KSKS24,7901957+0%

369Logan County, KSKS2,6611957+0%

370Morris County, KSKS5,3481957+0%

371Wallace County, KSKS1,4411957−0%

372Cheyenne County, NENE9,5281957+0%

373Divide County, NDND2,1101958+0%

374Emmons County, NDND3,2151958+0%

375Dickens County, TXTX1,6921958+0%

376Lane County, KSKS1,5081958+0%

377Bristol County, MAMA593,6401958+0%

378Calhoun County, MIMI133,4081958+0%

379Nobles County, MNMN22,3381958+0%

380Norman County, MNMN6,3361958+1%

381St. Louis County, MNMN200,5181958+0%

382Sheridan County, MTMT3,4361958+0%

383Brown County, NENE2,8261958+0%

384Butler County, NENE8,5071958+1%

385Harlan County, NENE3,0001958+0%

386White Pine County, NVNV8,6611958+0%

387Guadalupe County, NMNM4,3431958−0%

388Chenango County, NYNY45,7151958+0%

389Franklin County, NYNY46,5001958+1%

390St. Lawrence County, NYNY105,4881958+0%

391Logan County, NDND1,8591958+0%

392Ashtabula County, OHOH96,7131958+0%

393Lucas County, OHOH423,3471958+0%

394Ellis County, OKOK3,6131958+0%

395Tillman County, OKOK6,7801958+0%

396Cameron County, PAPA4,2111958+1%

397Columbia County, PAPA66,1931958+0%

398Mercer County, PAPA107,8601958+0%

399Mifflin County, PAPA46,1271958+0%

400Lipscomb County, TXTX2,9551958−0%

401Runnels County, TXTX9,6931958+0%

402Caledonia County, VTVT30,4141958+1%

403Brooke County, WVWV21,1421958+0%

404Marion County, WVWV55,5841958+0%

405Jefferson County, OHOH63,5971958+0%

406Knox County, TXTX3,1921958+0%

407Hamilton County, OHOH838,4181958+0%

408Rock Island County, ILIL141,8691958+0%

409Washington County, NYNY59,3531958+1%

410Alexander County, ILIL4,5701958−0%

411Brown County, ILIL6,4011958+1%

412Henry County, ILIL48,0951958+0%

413LaSalle County, ILIL107,7731958+0%

414Livingston County, ILIL35,0571958+0%

415Montgomery County, ILIL28,0761958+0%

416Schuyler County, ILIL6,6571958+0%

417White County, ILIL13,2501958+0%

418Miami County, ININ34,4871958+0%

419Allen County, KSKS12,3021958+0%

420Kiowa County, KSKS2,4321958+0%

421Labette County, KSKS19,6851958+0%

422Reno County, KSKS61,5391958+0%

423Toole County, MTMT5,2111958+0%

424Piute County, UTUT1,5091958+1%

425Roanoke, VAVA99,1111958+0%

426Coleman County, TXTX7,9151958+0%

427Grant County, NDND2,2061959−0%

428Norfolk County, MAMA739,7491959+0%

429Worcester County, MAMA888,5021959+0%

430Ontonagon County, MIMI5,8231959+0%

431Brown County, MNMN25,5171959+0%

432Linn County, MOMO11,8151959+0%

433Dawson County, MTMT8,6921959+0%

434Colfax County, NENE10,9341959+1%

435Dawes County, NENE7,8581959+0%

436Holt County, NENE10,0671959+0%

437Union County, NMNM3,8441959+0%

438Onondaga County, NYNY466,5841959+0%

439Schuyler County, NYNY16,9241959+0%

440Barnes County, NDND10,5731959+0%

441Traill County, NDND7,9201959+0%

442Henry County, OHOH27,5981959+0%

443Mahoning County, OHOH224,7061959+0%

444Marion County, OHOH65,1151959+0%

445Kiowa County, OKOK8,1811959+0%

446Wheeler County, OROR1,4721959+0%

447Erie County, PAPA265,8321959+0%

448Washington County, PAPA210,8021959+0%

449Harding County, SDSD1,3311959+0%

450Marshall County, SDSD4,4261959+0%

451Perkins County, SDSD2,8531959+0%

452Baylor County, TXTX3,4721959+0%

453Borden County, TXTX5671959−0%

454Childress County, TXTX6,6431959+0%

455Hale County, TXTX31,8191959−0%

456Haskell County, TXTX5,4991959+0%

457Shackelford County, TXTX3,1971959+0%

458Stonewall County, TXTX1,1861959−0%

459Manitowoc County, WIWI81,7101959+0%

460Wilbarger County, TXTX12,4811959+0%

461Lawrence County, ILIL13,7901959+0%

462Adams County, ILIL64,2671959+0%

463Shelby County, ILIL20,5761959+0%

464Whiteside County, ILIL54,1211959+0%

465Fayette County, ININ23,5331959+0%

466Vigo County, ININ106,5121959+0%

467Carroll County, IAIA20,3031959+0%

468Clay County, IAIA16,2021959+0%

469Anderson County, KSKS8,0181959+0%

470Greeley County, KSKS1,1821959+0%

471Sherman County, KSKS5,7631959+0%

472Wyandotte County, KSKS170,5971959+0%

473Treasure County, MTMT7281959+0%

474Hardeman County, TXTX3,2921959+0%

475Columbia County, WAWA4,1411959+1%

476Carroll County, MOMO8,4171960+1%

477Teton County, MTMT6,4961960+1%

478Hamlin County, SDSD6,9001960+1%

479Bay County, MIMI102,1231960+0%

480Dickinson County, MIMI25,8271960+0%

481Menominee County, MIMI22,9411960+0%

482Lake County, MNMN10,7461960+0%

483Wilkin County, MNMN6,2881960+1%

484Buchanan County, MOMO83,5401960+0%

485Knox County, MOMO3,7281960+0%

486Carter County, MTMT1,3831960+0%

487Pondera County, MTMT6,0721960+0%

488Adams County, NENE31,0711960+0%

489Gage County, NENE21,7111960+0%

490Howard County, NENE6,5381960+1%

491Kearney County, NENE6,7901960+0%

492Otoe County, NENE16,5311960+1%

493Rock County, NENE1,2591960+0%

494Thurston County, NENE6,7521960+0%

495York County, NENE14,5641960+0%

496Columbia County, NYNY60,1681960+0%

497Jefferson County, NYNY111,5401960+0%

498Madison County, NYNY67,1201960+0%

499Columbiana County, OHOH99,3771960+0%

500Harper County, OKOK3,1721960+0%

SHOWING 1–500 OF 3,108

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Download CSV (full list, 3,108 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS

Frequently asked

Which county has the lowest median year built?

Antelope County, Nebraska ranks #1 with 1940 (2010 Decennial Census).

What are the top 5 counties by median year built?

Antelope County, Nebraska, Schuylkill County, Pennsylvania, Adams County, Iowa, Furnas County, Nebraska, Jefferson County, Nebraska.

How many counties are in this ranking?

3,108 counties qualify after filtering for population minimums and data availability. The ranking covers 2010 Decennial Census data.

How is median year built measured?

Median year that housing structures were built. Source: US Census Bureau, 2010 Decennial Census.