All Countries
Johnston, IA
Full City Profile · Iowa · Polk County County
4.0
/5.0
A
Great
24,196
Population
1,241/sq mi density
$103,430
Median Income
$56,641 per capita
$346,200
Home Value
$393,938 Zillow
$1,288
Median Rent
29.6% income on rent
50°F
Avg Temperature
275 sunny days/yr
128
Violent Crime/100K
1,198 property/100K
A
Overall
4.0 / 5.0
Strong
A+
Economy
5.0 / 5.0
$103,430 median income, 1.2% unemployment
A+
Affordability
4.8 / 5.0
$346,200 home value, $1,288/mo rent
F
Safety
1.0 / 5.0
128 violent crimes/100K
A+
Education
5.0 / 5.0
57.9% bachelor's degree or higher
Change Over Time (2013–2023)
Population Change
+29.1%
19,060 → 24,598
over 10 years
Annual Pop. Growth
+2.58%
Compound annual growth rate
Median Income Change
+10.5%
$93,571 → $103,430
nominal, not inflation-adjusted
Annual Income Growth
+1.01%
Compound annual growth rate
Population Over Time
Total population for Johnston across each available Census ACS release.
Median Household Income Over Time
Median household income reported by U.S. Census ACS. Values are nominal (not adjusted for inflation).
Projected 2030
Simple projections extrapolating the 2013–2023 compound annual growth rate forward. These are mathematical extensions of recent trends, not forecasts — real outcomes depend on migration, policy and economic shifts.
Projected Population 2030
29,399
+4,801 from 2023 (24,598)
Projected Median Income 2030
$110,968
+$7,538 from 2023 ($103,430)
Year-by-Year Detail
| Year | Population | YoY % | Median Income | YoY % |
|---|---|---|---|---|
| 2013 | 19,060 | — | $93,571 | — |
| 2015 | 19,702 | +3.4% | $97,457 | +4.2% |
| 2017 | 21,545 | +9.4% | $94,539 | -3% |
| 2019 | 22,588 | +4.8% | $96,948 | +2.5% |
| 2021 | 24,195 | +7.1% | $93,363 | -3.7% |
| 2023 | 24,598 | +1.7% | $103,430 | +10.8% |
Source: U.S. Census ACS 5-Year Estimates (Data Commons). Home value and rent are not yet available historically.