How to Compare Two U.S. Cities Using Free Census Data

Whenever you're considering a move, the temptation is to read sponsored 'best places to live' lists and listen to vibes from people who already live there. Both are biased. The Census Bureau publishes everything you need to make a clean head-to-head comparison, free, for any U.S. city or ZIP.

The five-variable framework

We've built the City Zip Compare engine around five variables that capture roughly 85% of what matters in a relocation decision. They are, in rough order of impact:

• Median household income (B19013) — the wage and earnings base
• Median gross rent or median home value (B25064 / B25077) — the dominant cost
• Bachelor's-degree share (B15003) — predicts schools, employer mix, dining/cultural scene
• Average commute time (B08303) — single best proxy for daily quality of life
• Median age (S0101) — captures the social fabric you'll fit into or fight against

How to interpret the numbers together

Step one: compute rent-to-income ratio for each city. Anything over 30% is cost-burdened territory.

Step two: subtract bachelor's-degree shares. A 10-point gap is a meaningful cultural and economic difference. A 25-point gap is a different country.

Step three: compare commute times. A 10-minute difference is 80 hours per year of life back.

Step four: check median age. If you're 32 with kids and the median age is 52, you'll feel out of place.

Step five: read both cities' employment-by-industry breakdown (table C24030). If the industry mix doesn't include your career, the move is structurally risky regardless of how good the COL math looks.

Worked example: Nashville vs Charlotte

Both are mid-sized Sun Belt growth cities. Median household income: Nashville $70,300, Charlotte $74,200. Median home value: $360,000 vs $315,000. Bachelor's-degree share: 39% vs 41%. Average commute: 24.6 vs 26.1 minutes. Median age: 35 vs 35.

On the numbers, Charlotte has slightly stronger income, slightly cheaper housing, and a slightly more credentialed workforce. Nashville offsets with a marginally shorter commute. The tiebreaker for most movers is industry mix (Nashville heavy in healthcare and music; Charlotte heavy in banking and tech) and personal preference on cultural texture.

What this framework can't tell you

Crime, school quality, weather, social fit, and political climate are not in ACS5. Use the FBI UCR for crime, NCES for schools, NOAA for weather. For political climate, use county-level voting data from the MIT Election Lab.

But for income, housing, and the structural fit of a city to your life, ACS5 is enough. The City Zip Compare tool runs all of this on demand for any two U.S. places.