Population Differences: Boston, Chicago, Houston & San Francisco (2021)

Based on 2021 U.S. Census Bureau estimates, here are the populations and pairwise differences for four major U.S. cities.

📊 Population Figures (2021)

📈 Pairwise Differences

🧠 Key Takeaways

• Chicago & Houston are in the same tier (2.3–2.7M) — "Second Tier" after NYC (8.8M) & LA (3.8M)
• San Francisco & Boston are similar-sized "major but not mega" — both constrained by geography
• Metro areas tell different story: SF Bay Area (4.7M) > Boston MSA (4.9M) > Houston MSA (7.1M) > Chicago MSA (9.4M)
• Trends (2020–2023): Houston growing; Chicago, SF, Boston declining slightly

City proper populations ≠ metro reality — but they define tax base, governance, and identity.