City in Iowa County, Iowa · 3.4 sq mi · 1,014 people per sq mi
3,416 people live in Williamsburg. The typical household earns $58,059, and the median resident is 33.8 years old.
2026 projection
From 3,346 in 2020
Poverty rate 5.76%
Men 31.8 · Women 38.9
1890–2026
3,416
2026 projection
2.1% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1890–2026
3,416
2026 projection
2.1% since 2020 (increase)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 3,416 | +8 | 0.23% |
|---|---|---|---|
| 2025 | 3,408 | +21 | 0.62% |
| 2024 | 3,387 | +26 | 0.77% |
| 2023 | 3,361 | -4 | 0.12% |
| 2022 | 3,365 | 0 | 0.00% |
| 2021 | 3,365 | +19 | 0.57% |
| 2020 | 3,346 | +27 | 0.81% |
| 2019 | 3,319 | +31 | 0.94% |
| 2018 | 3,288 | +26 | 0.80% |
| 2017 | 3,262 | +9 | 0.28% |
Showing 10 of 29 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
Williamsburg is growing faster than Iowa County, about as fast as Iowa, and slower than the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 34 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 17 residents
47% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 47% | 46% | 47% |
| Never married | 38% | 45% | 31% |
| Divorced | 8% | 7% | 8% |
| Widowed | 8% | 2% | 14% |
| Separated | 0% | 0% | 0% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources