Residential delivery area · Illinois
ZIP Code 61031: Franklin Grove, IL
ZIP code 61031 uses the postal name Franklin Grove, Illinois and lies mostly in Lee County (95% of its land) with the rest in Ogle County (Census 2020 ZIP-county file). About 1,500 people live there (Census Bureau, ACS 2020-2024). Median household income is $75,446 (Census Bureau, ACS 2020-2024). By Census place, 1% of its land lies in Franklin Grove; 99% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2023
- ZBP2023
- IRS2022
- Town
- Franklin Grove · its only residential ZIP
- County
- Lee County (95%); Ogle County (5%)
- Census places
- Franklin Grove
- Micro area
- Dixon, IL
- House district
- IL-16 119th Congress
- State
- Illinois
- Time zone
- Central
- Land area
- 44.9 sq mi · 33 people per sq mi
Where is ZIP code 61031?
61031 centers on 41.830°, -89.321° and covers 44.9 square miles of land plus 0.0 of water. It borders 6 ZIP codes: 61057, 61006, 61021, 61310, 61378, 61061.
The map draws ZIP code areas only. For the streets inside 61031, 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 61031 compare with the rest of Lee County?
| Measure | 61031 | In Lee County | In IL |
|---|---|---|---|
| People (ACS 2020-2024) | 1,492 | 11th of 24 | 760th of 1,396 |
| Median household income | $75k | 2nd of 13 | 450th of 797 |
| Median home value | $137k | 10th of 14 | 605th of 842 |
Its median household income is higher than in 56% of U.S. residential ZIP codes, and it is denser than 35% of all 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 61031?
The 2020 Census counted 1,430 people in 61031; the ACS, which samples households over 2020-2024, estimates 1,492. Between the 2010 and 2020 censuses its population fell 13.6% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 1,492±213 (90% margin)
- 2020 Census count
- 1,430−13.6% since 2010 (1,656)
- Households
- 607
- Median age
- 49.9
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 61031?
Of the 1,492 people the ACS estimates in 61031, 14.3% are under 18 and 28.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (87.0%).
- Under 1814.3%
- 18 to 6456.8%
- 65 and older28.9%
- White, not Hispanic87.0%
- Hispanic or Latino8.6%
- Other or two or more3.6%
- Black, not Hispanic0.5%
- Asian, not Hispanic0.2%
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 61031 earn?
Median household income is $75,446 (ACS 2020-2024), the 2nd highest of the 13 ranked ZIP codes in Lee County. It is not measurably different from 2015-2019 ($72,922 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $75,446±$18,500
- Income per person
- $35,828
- Below the poverty line
- 8.2%
- Unemployed (of the labor force)
- 0.8%
- Adults 25+ with a bachelor's degree
- 28.2%
- Adjusted gross income per tax return, 2022
- $68,113680 returns; wages 64% 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 61031?
- Median home value (owners' estimate)
- $136,700
- Median gross rent
- $823
- Homes owned by their occupants
- 77.4%
- Housing units
- 652
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 61031?
19 business establishments had a location in this ZIP code in 2023, 3 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction5
- Transportation and warehousing3
- 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 61031?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 61057 | Nachusa | 30 | – | 3.2 mi |
| 61006 | Ashton | 1,541 | $76k | 6.5 mi |
| 61021 | Dixon | 22,308 | $69k | 8.0 mi |
| 61310 | Amboy | 3,347 | $70k | 9.0 mi |
| 61378 | West Brooklyn | 513 | $85k | 11.3 mi |
| 61061 | Oregon | 6,766 | $88k | 11.7 mi |
| 61331 | Lee Center | 0 | – | 6.1 mi (near) |
| 61324 | Eldena | 97 | – | 6.3 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.