| ZIP Codes: | 12 ZIP Codes (9 Standard, 3 PO Box, 0 Unique) [See All] |
| Area Code: | 712 |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 11:53:08 PM |
| Population: | 21,140 [See All] |
| FIPS: | 19027 |
| CBSA: | Carroll, IA |
| Land Area: | 697 sq mi |
| Water Area: | 1 sq mi |
| Coordinates: | 42.0254, -94.8568 |
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21,140 residents live across 12 ZIPs covering 697 sq mi, served by 12 distinct USPS-recognized cities.
Population moved from 21,525 to 20,963 from 2014 to 2024 — a -2.6% change. 2 ZIPs gained residents, 9 lost.
The county's wealthiest ZIP 51440 (Dedham, $87,750 median) and poorest ZIP 51452 (Lidderdale, $60,625) are 14.6 miles apart — a 1.4× income gap across local geography.
Median home values vary 1.8× across this county — from $123,400 in 51452 (Lidderdale) to $223,200 in 51440 (Dedham).
Density varies 111× across the county — from 12 people/sq mi in 51440 (Dedham) to 1,371 in 51444 (Halbur).
Educational attainment ranges from 6.8% bachelor's+ in 51452 (Lidderdale) to 35.0% in 51440 (Dedham) — the breadth of educational profiles across the area.
Within Iowa, this is the #29 most populous of 99 counties and ranks #56 for median household income .
Weighted by population, the typical household earns about $73,221 across the county — reflecting what a typical resident sees, not a simple ZIP average.
24.6% of adults age 25+ hold a bachelor's degree or higher (3,550 of 14,413 reporting).
9 Standard delivery, 3 PO Box only, 0 single-entity Unique ZIPs serve this county.
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 51401 | Carroll | Standard | 11,990 | $70,702 | 170.2 | -1.3% |
| 51455 | Manning | Standard | 2,279 | $76,786 | 112.1 | -2.2% |
| 50058 | Coon Rapids | Standard | 1,999 | $80,119 | 137.4 | -2.8% |
| 51443 | Glidden | Standard | 1,653 | $78,906 | 107.9 | -13.0% |
| 51430 | Arcadia | Standard | 1,063 | $76,250 | 46.6 | 30.3% |
| 51436 | Breda | Standard | 815 | $61,926 | 59.2 | -1.8% |
| 51463 | Templeton | Standard | 412 | $78,571 | 32.1 | -38.4% |
| 51440 | Dedham | Standard | 334 | $87,750 | 27.1 | -9.0% |
| 51444 | Halbur | PO Box | 290 | $82,750 | 0.2 | 25.5% |
| 51452 | Lidderdale | PO Box | 177 | $60,625 | 2.7 | — |
| 51451 | Lanesboro | PO Box | 74 | $43,750 | 0.6 | -27.5% |
| 51459 | Ralston | Standard | 54 | $63,333 | 0.6 | -31.6% |