50666 ZIP Code — Plainfield, IA

Bremer County, Iowa

ZIP code 50666 is located in Plainfield, Iowa, within Bremer County. It covers approximately 49.37 square miles and serves a population of 720 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 319.

About ZIP code 50666

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1970s, giving the area an established character. Median home value is $163,600. Owner-occupancy is high at 88%, well above the national average.

Median household income is $72,857. The poverty rate of 5% is below the national average. 51% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is production, transportation, and material moving, with manufacturing as the leading industry. The average commute of 26 minutes is near the national average.

College attainment at 11% is below the national average, consistent with a trades and production-oriented local economy.

Overall, ZIP code 50666 reflects a community defined by a trades-oriented workforce, high homeownership, and a significant Social Security-dependent population.

720

population

49.37

sq mi land

Standard

ZIP type

Central (CT)

timezone

50666 ZIP code map

Cities in ZIP code 50666

Below are the cities the US Postal Service accepts for ZIP code 50666. Using any city not on this list may result in mail delivery delays.

City	Status
Plainfield	Preferred

Nearby ZIP codes

50677 Waverly (5.8 mi) 50658 Nashua (8.3 mi) 50619 Clarksville (9.7 mi) 50676 Tripoli (11.6 mi) 50645 Ionia (12.1 mi) 50670 Shell Rock (13.1 mi) 50647 Janesville (13.7 mi) 50622 Denver (14.6 mi) 50630 Fredericksburg (16.5 mi) 50602 Allison (16.8 mi) 50636 Greene (17.8 mi) 50659 New Hampton (18.3 mi)

Demographics updated 05/2026

Population
Total population	720
Population density	15 / sq mi
State FIPS	19
County FIPS	017

Geography
Land area	49.37 sq mi
Water area	0.30 sq mi
Latitude	42.8476
Longitude	-92.4953
Timezone	Central (CT)
Area code	319

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	28.1%	30.8%	40.1%
$50k – $100k	56.6%	37.7%	33.4%
$100k – $200k	14.8%	28.2%	21.5%
Over $200k	0.5%	3.3%	5.0%

Demographics & statistics

720

Population

People per sq mi

54.3

Median age

$72,857

Median household income

$34,882

Per capita income

$163,600

Median home value

$646

Median monthly rent

87.9%

Home ownership

4.9%

Poverty rate

6.0%

Unemployment

316

Housing units

11.2%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

15–19

20–24

25–34

35–44

45–54

55–59

60–64

65–74

103

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	129	17.9%
18 and over	591	82.1%
65 and over	271	37.6%
Median age	54.3 years

Race & ethnicity

White 97.5%

Two or more races 1.7%

Native Hawaiian / Pacific Islander 0.7%

American Indian / Alaska Native 0.1%

Group	Count	%
White	702	97.5%
Two or more races	12	1.7%
Native Hawaiian / Pacific Islander	5	0.7%
American Indian / Alaska Native	1	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	28.1%	30.8%	40.1%
$50k – $100k	56.6%	37.7%	33.4%
$100k – $200k	14.8%	28.2%	21.5%
Over $200k	0.5%	3.3%	5.0%

Under $10k 1.8%

$10k–$15k 0.3%

$15k–$25k 6.7%

$25k–$35k 3.0%

$35k–$50k 13.3%

$50k–$75k 37.6%

$75k–$100k 17.0%

$100k–$150k 16.7%

$150k–$200k 2.4%

$200k+ 1.2%

Range	% of households
Under $10k	1.8%
$10k–$15k	0.3%
$15k–$25k	6.7%
$25k–$35k	3.0%
$35k–$50k	13.3%
$50k–$75k	37.6%
$75k–$100k	17.0%
$100k–$150k	16.7%
$150k–$200k	2.4%
$200k+	1.2%
Median income	$72,857

Housing

Home values

Under $50k 2.8%

$50k–$100k 21.7%

$100k–$150k 19.3%

$150k–$200k 18.6%

$200k–$300k 32.8%

$300k–$500k 4.8%

Housing overview

Metric	Value
Median home value	$163,600
Median rent / month	$646
Owner occupied	87.9%
Renter occupied	12.1%
Vacant	7.3%
Single-family detached	97.5%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	5.6
Avg household size (owned)	2.18

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	6.2%
1990–1999	5.6%
1980–1989	2.2%
1970–1979	28.9%
1960–1969	16.6%
1950–1959	9.3%
1940–1949	3.9%
1939 or earlier	27.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	5.1%
2 bedrooms	37.4%
3 bedrooms	45.2%
4 bedrooms	7.6%
5+ bedrooms	4.8%

Vehicles per household

Vehicles	% of households
No vehicle	0.3%
1 vehicle	21.2%
2 vehicles	33.3%
3 or more	45.2%

Heating fuel

Fuel type	%
Utility gas	50.0%
Electricity	10.6%
Propane / LP gas	35.8%
Fuel oil	0.3%
Wood	3.0%
No fuel used	0.3%

Households & families

Household type	Count	%
Married-couple family	197	59.7%
Cohabiting couple	15	4.5%
Male householder, no spouse	58	17.6%
Female householder, no spouse	60	18.2%
Households with children under 18	83	25.2%
Households with seniors (65+)	154	46.7%
Average household size	2.18

Marital status

Status	Male	Female
Never married	16.1%	20.4%
Married	67.2%	66.5%
Separated	0.0%	0.0%
Widowed	1.3%	8.5%
Divorced	15.4%	4.7%

Education

Less than 9th grade 0.2%

Some HS, no diploma 2.7%

HS graduate 52.8%

Some college, no degree 22.7%

Associate's degree 10.5%

Bachelor's degree 10.8%

Graduate / professional 0.4%

Metric	%
HS diploma or higher	97.2%
Bachelor's or higher	11.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	6	5.8%
Kindergarten	1	1.0%
Elementary school	46	44.2%
High school	46	44.2%
College / grad school	5	4.8%

Employment

Industry of employment

Manufacturing 35.8%

Education & healthcare 14.5%

Retail trade 13.6%

Construction 8.4%

Transportation & utilities 6.9%

Public administration 5.5%

Finance & real estate 4.9%

Professional & management 3.8%

Agriculture & mining 2.0%

Information 1.7%

Wholesale trade 1.2%

Other services 1.2%

Arts, food & hospitality 0.6%

Occupation

Category	%
Management, business & arts	22.5%
Service	11.0%
Sales & office	16.8%
Natural resources & construction	11.6%
Production & transportation	38.2%

Employment type

Type	%
Private sector	77.7%
Government	14.2%
Self-employed	7.8%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	89.3%
Carpool	5.5%
Public transit	0.3%
Walk	0.0%
Work from home	4.6%
Other means	0.3%
Avg commute (minutes)	25.8

Poverty

All people 4.9%

Under 18 years 17.1%

18 and over 2.2%

Married-couple families 0.0%

Female-led households 18.9%

Income support

Source	% of households
Social Security	51.2%
Retirement income	26.7%
Supplemental Security	0.6%
Cash public assistance	1.2%
Food stamps / SNAP	7.6%

Health indicators

Condition	%
Obesity	40.3%
High blood pressure	32.7%
High cholesterol	33.0%
Diabetes	9.7%
Heart disease	6.5%
Stroke	2.9%
Asthma	9.2%
Arthritis	24.9%
Kidney disease	2.7%
Pulmonary disease	6.7%
Cancer	6.8%

Behavior / access	%
Smoking	18.1%
Binge drinking	22.8%
No physical activity	24.1%
Less than 7 hrs sleep	30.0%
Depression	17.4%
Fair or poor health	12.2%
Poor mental health	13.4%
Poor physical health	9.5%
No health insurance	9.0%
Visited doctor (checkup)	75.2%
Visited dentist	69.0%
Cholesterol screening	88.4%
Teeth loss	12.3%

Veterans & disability

Veterans	Count	%
Civilian veterans	61	10.3%

Disability	%
Any disability	9.6%
Under 18	0.8%
18–64 years	10.0%
65 and over	13.3%

Health insurance coverage

Type	%
Private insurance	80.8%
Public insurance	58.6%
No insurance	1.7%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	687	95.4%
Spanish	1	0.1%
Other Indo-European	0	0.0%
Asian & Pacific Islander	1	0.1%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	719	99.9%
Born in same state	714	99.2%
Born in different state	655	91.0%
Foreign born	5	0.7%
Naturalized citizen	1	0.1%
Not a US citizen	1	100.0%

Ancestry

Ancestry	Count	%
Italian	44	6.1%
Arab	39	5.4%
French	36	5%

Ancestry	Count	%
Polish	25	3.5%
English	17	2.4%
Dutch	7	1%

Technology access

Metric	% of households
Computer access	45.8%
Internet access	94.2%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 50666

What city is ZIP code 50666 in?

ZIP code 50666 is primarily assigned to Plainfield, Iowa.

What county is ZIP code 50666 in?

ZIP code 50666 falls within Bremer County, Iowa.

Does ZIP code 50666 have an older population?

38% of residents in ZIP code 50666 are 65 or older, above the national average of ~17%.

Does ZIP code 50666 have a large retiree population?

51% of households in ZIP code 50666 receive Social Security income, suggesting a significant retiree or disability population.

Is ZIP code 50666 mostly owner-occupied?

88% of occupied units in ZIP code 50666 are owner-occupied, well above the national average.

How educated is the population of ZIP code 50666?

11% of residents hold a bachelor's degree or higher — below the national average of ~33%, consistent with a trades-oriented local economy.

What timezone is ZIP code 50666 in?

ZIP code 50666 observes the CST timezone.