Residential delivery area · Iowa
ZIP Code 50666: Plainfield, IA
ZIP code 50666 uses the postal name Plainfield, Iowa and lies mostly in Bremer County (76% of its land) with the rest in Butler County (Census 2020 ZIP-county file). About 750 people live there (Census Bureau, ACS 2020-2024). Median household income is $79,867 (Census Bureau, ACS 2020-2024). By Census place, under 1% of its land lies in Plainfield; more than 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2023
- ZBP2023
- IRS2022
- Town
- Plainfield · its only residential ZIP
- County
- Bremer County (76%); Butler County (24%)
- Census places
- Plainfield
- Metro area
- Waterloo-Cedar Falls, IA
- House district
- IA-2 119th Congress
- State
- Iowa
- Time zone
- Central
- Land area
- 49.4 sq mi · 15 people per sq mi
Where is ZIP code 50666?
50666 centers on 42.854°, -92.503° and covers 49.4 square miles of land plus 0.3 of water. It borders 4 ZIP codes: 50658, 50677, 50619, 50645.
The map draws ZIP code areas only. For the streets inside 50666, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 50666 compare with the rest of Bremer County?
| Measure | 50666 | In Bremer County | In IA |
|---|---|---|---|
| People (ACS 2020-2024) | 753 | 12th of 13 | 554th of 970 |
| Median household income | $80k | not ranked | not ranked |
| Median home value | $204k | not ranked | not ranked |
50666's income and home value are not ranked: it has fewer than 1,000 residents (753). Rankings use ZIP codes of 1,000 or more people living in households, with margins at most 25% of the figure.
It is denser than 22% of U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 50666?
The 2020 Census counted 893 people in 50666; the ACS, which samples households over 2020-2024, estimates 753. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 753±223 (90% margin)
- 2020 Census count
- 893
- Households
- 321
- Median age
- 49.6
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 50666?
Of the 753 people the ACS estimates in 50666, 19.7% are under 18 and 26.8% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (95.4%).
- Under 1819.7%
- 18 to 6453.5%
- 65 and older26.8%
- White, not Hispanic95.4%
- Other or two or more2.9%
- Hispanic or Latino1.5%
- Asian, not Hispanic0.3%
- Black, not Hispanic0.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 50666 earn?
Median household income is $79,867 (ACS 2020-2024).
- Median household income
- $79,867±$18,879
- Income per person
- $38,596
- Below the poverty line
- 4.2%
- Unemployed (of the labor force)
- 3.8%
- Adults 25+ with a bachelor's degree
- 7.8%
- Adjusted gross income per tax return, 2022
- $71,038420 returns; wages 70% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 50666?
- Median home value (owners' estimate)
- $203,700
- Median gross rent
- $684
- Homes owned by their occupants
- 94.7%
- Housing units
- 365
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 50666?
18 business establishments had a location in this ZIP code in 2023, 2 fewer than in 2018; the most are in other services (except public administration) (ZIP Code Business Patterns).
- Other services (except public administration)4
- Construction3
- Finance and insurance3
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 50666?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 50658 | Nashua | 2,450 | $72k | 6.9 mi |
| 50677 | Waverly | 12,673 | $86k | 6.9 mi |
| 50619 | Clarksville | 2,150 | $84k | 9.0 mi |
| 50645 | Ionia | 1,193 | $64k | 11.8 mi |
| 50631 | Frederika | 225 | $59k | 10.0 mi (near) |
| 50676 | Tripoli | 2,017 | $87k | 11.9 mi (near) |
| 50670 | Shell Rock | 2,270 | $85k | 13.5 mi (near) |
| 50647 | Janesville | 1,978 | $104k | 14.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.