English only at home, explained

What it measures

The English-only share is the percentage of the population age 5 and older that speaks only English at home. The denominator is people 5+ (children under 5 are excluded because they may not yet be speaking). The metric is one of three top-level language categories the Census reports: English only, English and another language ("bilingual at home"), and another language only ("limited English at home"). The first category is the complement of the second and third combined.

The metric is the cleanest indicator of linguistic homogeneity at the place level. It complements the foreign-born share, places with low English-only shares typically have either large foreign-born populations or persistent multilingual communities (Hispanic households in the Southwest, French Canadian communities in parts of Maine, etc.).

Why it matters

Language data drives federal civil-rights enforcement (the Voting Rights Act language minority provisions, the bilingual-ballot requirement), translation requirements for federal programs, school dual-language program planning, and the design of public-service communications at the local level. The metric also matters for retail and consumer-marketing decisions in metros with substantial non-English populations.

How the Census measures it

ACS Table C16001, Language Spoken at Home. The Census asks each respondent 5 and older whether they speak a language other than English at home, and if so, what language. CensusEasy uses the share who answered "English only."

How to read the numbers

The US English-only share is about 78%. State rates range from about 55% (California, Texas, New Mexico) to over 95% (West Virginia, Vermont, Maine). Metros along the southern border, in coastal California, and in NYC sit in the 50-65% range; small inland metros and the rural North exceed 95%. A metro English-only share below 70% indicates a significant non-English-speaking population that shapes labor markets, schools, and consumer markets.

Caveats and limitations

The metric does not measure English proficiency among non-English-only households, many bilingual households have fully proficient English speakers. The "limited English proficiency" subset is reported separately. The metric also doesn't capture the full diversity of languages spoken: a place with 10% non-English-only could be 90% Spanish-speaking or split among dozens of languages, with very different policy implications.