Grundy County, IA demographics:
population, income, and more

Total population
12,384
0.3% year-over-year change
Median household income
$87,205/yr
4.3% year-over-year change
Housing units
5,498
0.2% year-over-year change

Grundy County population

How many people live in Grundy County

Grundy County is home to 12,384 residents, according to the most recent Census data. Gender-wise, 49.5% of Grundy County locals are male, and 50.5% are female.

Total population
12,384
0.3% year-over-year change
Gender ratio
Male
49.5%
6,131
Female
50.5%
6,253
Value Percent YoY change
Male 6,131 49.5% -0.2%
Female 6,253 50.5% 0.7%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Grundy County is 42, with the population distributed as follows: about 19.2% are children under 15, then 11% are in the 15 to 24 age group. Adults between 25 and 44 make up 23.6% of the population, while another 25.2% fall into the 45 to 64 bracket. Finally, around 21% are 65 or older.

Median age
41.9
Age breakdown
Under 15
19.2%
15 to 24
11%
25 to 44
23.6%
45 to 64
25.2%
Over 65
21%
Value Percent YoY change
Under 15 2,376 19.2% -0.7%
15 to 24 1,365 11% -0.4%
25 to 44 2,917 23.6% 1.3%
45 to 64 3,126 25.2% -0.5%
Over 65 2,600 21% 1.2%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Grundy County, 98.1% of the population are US-born citizens, while 0.7% have gained naturalized citizenship. At the same time, 1.3% of residents are non-citizens. As for race, 95.1% of locals are Caucasian, 0.6% are African American and 0.5% have Asian roots. There’s also a share of 1.8% that includes residents with two or more races.

Citizenship
U.S.-born citizens
98.1%
Non-U.S.-born citizens
0.7%
Non-citizens
1.3%
Value Percent YoY change
U.S.-born citizens 12,144 98.1% -0.0%
Non-U.S.-born citizens 82 0.7% -31.1%
Non-citizens 158 1.3% 85.9%
Racial breakdown
White
95.1%
Black or African American
0.6%
American Indian and Alaska Native
0.5%
Asian
0.5%
Native Hawaiian and other Pacific Islander
0%
Two or more races
1.8%
Other
1.5%
Value Percent
White 11,777 95.1%
Black or African American 71 0.6%
American Indian and Alaska Native 58 0.5%
Asian 59 0.5%
Two or more races 228 1.8%
Other 191 1.5%

Households in Grundy County

A peek inside Grundy County households

Grundy County has 5,117 households, with an average of 2 members in each. Of these, 67.9% are families, while the remaining 32.1% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
5,117
0.6% year-over-year change
Average people per household
2
Non-family households
1,642
Family households
3,475
Value Percent YoY change
Non-family households 1,642 32.1% -0.1%
Family households 3,475 67.9% 1.0%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Grundy County

The housing landscape of Grundy County

Grundy County's housing consists of 5,498 units, with 85% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 1.4% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 2.9% of the housing landscape.

Housing units
5,498
0.2% year-over-year change
Housing types
Value Percent
1 unit, detached 4,672 85%
1 unit, attached 76 1.4%
2 units 31 0.6%
3 or 4 units 307 5.6%
5 to 9 units 118 2.2%
10 to 19 units 44 0.8%
20 to 49 units 92 1.7%
Mobile home 158 2.9%
Homes built since 2020
38
137.5% year-over-year change

The age of buildings in Grundy County

In Grundy County, the median construction year is 1962. About 33.4% of homes were built before the 1940s, with another 5.6% going up by 1949. Most development happened in the second half of the 20th century. Then, 9.2% of homes were added from 2000 to 2009, 3.3% between 2010 and 2019, and 0.7% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,834 33.4% -2.5%
Built between 1940 and 1949 308 5.6% -4.3%
Built between 1950 and 1959 513 9.3% -6.9%
Built between 1960 and 1969 436 7.9% -15.2%
Built between 1970 and 1979 1,003 18.2% 13.7%
Built between 1980 and 1989 315 5.7% 2.6%
Built between 1990 and 1999 360 6.6% -9.1%
Built between 2000 and 2009 508 9.2% 20.4%
Built between 2010 and 2019 183 3.3% -7.6%
Built in 2020 or later 38 0.7% 137.5%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Grundy County occupancy rates

Out of the 5,117 occupied housing units in Grundy County, 84.5% are owner-occupied, while 15.5% are lived in by tenants. Meanwhile, 6.9% of all homes on the local market sit vacant.

Occupied housing units
5,117
0.6% year-over-year change
Occupancy breakdown
Renter occupied
794
Owner occupied
4,323
Value Percent YoY
change
Renter occupied 794 15.5% -2.6%
Owner occupied 4,323 84.5% 1.2%
Unoccupied housing units
6.9%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Grundy County housing costs

Housing costs in Grundy County come to a median of $1,011 per month, while tenants specifically pay a median gross rent of $774.

Median housing costs per month
$1,011/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Grundy County
$774/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Grundy County

Grundy County education at a glance

About 37% of the population in Grundy County went to high school, while 20.1% pursued college studies. Another 16% earned an associate degree and 19.4% hold a bachelor’s. Meanwhile, 6.8% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 66 0.7% 6.5%
High school diploma 3,505 37% -0.2%
College diploma 1,904 20.1% -6.8%
Associate degree 1,519 16% -5.6%
Bachelor's degree 1,842 19.4% 10.2%
Graduate degree 643 6.8% 19.5%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Grundy County

How much people earn in Grundy County

The average annual household income in Grundy County was $101,039 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +6.2% change from the previous year. At the same time, the median income stood at $87,205, reflecting a +4.3% shift over the same period.

Average household income in Grundy County
$101,039/year
6.2% year-over-year change
Median household income in Grundy County
$87,205/year
4.3% year-over-year change

Grundy County income by age

In Grundy County, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $99,832. Those with someone between 45 and 64 in charge, often well established professionally, earn $104,625 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $57,750, while those led by someone over 65, many of whom may be retired, have about $60,444 in earnings. Overall, 93.5% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $57,750 -0.2%
25 - 44 $99,832 7.3%
45 - 64 $104,625 1.2%
Over 65 $60,444 5.2%
Above poverty level
11,306
Below poverty level
787
Value Percent YoY
change
Above poverty level 11,306 93.5% -0.0%
Below poverty level 787 6.5% 1.6%

Employment in Grundy County

Workforce and job types in Grundy County

The job market in Grundy County is powered by 6,316 working residents, spread across a range of industries and roles. 72.5% of the working population are employed in professional or administrative positions, while 27.5% are in hands-on or service-based jobs. Also, 13.5% run their own businesses, 64.5% are employed by private companies, and 13.9% work in the public sector.

Workforce demographics

Working population
6,316
-0.6% year-over-year change
White collar
4,580
Blue collar
1,736
Value Percent YoY change
White collar 4,580 72.5% -0.3%
Blue collar 1,736 27.5% -1.2%
Employer type
Self employees
13.5%
Private companies
64.5%
Governmental workers
13.9%
Not for profit companies
8.1%
Value Percent YoY change
Self employees 855 13.5% -0.1%
Private companies 4,071 64.5% -0.1%
Governmental workers 879 13.9% 0.1%
Not for profit companies 511 8.1% -5.4%
Unemployment rate
2.0%
-11.3% year-over-year change

Available workforce

The unemployment rate in Grundy County stands at 2%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Grundy County

How people get around in Grundy County

Commuting methods vary: 87.8% of residents travel by personal vehicle and 2.4% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 5,458 87.8% -0.5%
Bus or trolleybus 3 0% -66.7%
Motorcycle 2 0% -60.0%
Bicycle 14 0.2% 27.3%
Walk 150 2.4% 31.6%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Grundy County by zipcode?

Zipcode Population Number of households Median income Average income
50621 1,601 656 $88,077 $105,886
50624 1,855 685 $96,713 $120,764
50627 3,276 1,219 $74,536 $83,688
50638 3,441 1,361 $85,223 $102,697
50642 577 253 $108,750 $123,814
50660 1,143 441 $95,969 $102,772
50601 2,299 1,048 $66,250 $72,863
50604 1,590 663 $66,776 $77,574
50609 377 174 $90,250 $97,507
50613 43,867 17,126 $78,503 $105,181

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FAQs about Grundy County demographics 

What is the total population of Grundy County?

Grundy County has a total population of 12,384 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by +0.3% compared to a year ago.

What is the gender ratio in Grundy County?

The gender ratio in Grundy County is as follows:
  • 49.5% males (6,131 residents)
  • 50.5% females (6,253 residents)

What is the median age in Grundy County?

The median age in Grundy County is 41.9.

What is the age distribution of the population in Grundy County?

The age distribution in Grundy County is as follows:
  • Under 15: 19.2% (2,376 residents)
  • Ages 15-24: 11% (1,365 residents)
  • Ages 25-44: 23.6% (2,917 residents)
  • Ages 45-64: 25.2% (3,126 residents)
  • Over 65: 21% (2,600 residents)

What is the racial and ethnic makeup of Grundy County?

The racial and ethnic makeup of Grundy County is as follows:
  • White: 95.1% (11,777 residents)
  • Black or African American: 0.6% (71 residents)
  • American Indian and Alaska Native: 0.5% (58 residents)
  • Asian: 0.5% (59 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 1.8% (228 residents)
  • Other: 1.5% (191 residents)

What percentage of the population in Grundy County are U.S.-born citizens?

U.S.-born citizens represent 98.1% of the population in Grundy County.

How many housing units are there in Grundy County?

There are 5,498 housing units in Grundy County, reflecting a +0.2% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Grundy County and what is the average household size?

Grundy County has a total of 5,117 households, with an average of 2 people in each.

What is the median household income in Grundy County?

Grundy County has a median household income of $87,205, representing a +4.3% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Grundy County?

The employment rate is 98% in Grundy County, with a workforce of 6,316 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 72.5% (4,580 residents)
  • Blue-collar workers: 27.5% (1,736 residents)

Places of employment:
  • Self-employed: 13.5% (855 residents)
  • Private companies: 64.5% (4,071 residents)
  • Governmental workers: 13.9% (879 residents)
  • Not-for-profit companies: 8.1% (511 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025