Residential delivery area · Minnesota
ZIP Code 55309: Big Lake, MN
ZIP code 55309 uses the postal name Big Lake, Minnesota and lies entirely in Sherburne County (Census 2020 ZIP-county file). About 21,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $121,711 (Census Bureau, ACS 2020-2024). By Census place, 11% of its land lies in Big Lake, and under 1% in smaller places; 88% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Big Lake · its only residential ZIP
- County
- Sherburne County
- Census places
- Big Lake
- Metro area
- Minneapolis-St. Paul-Bloomington, MN-WI
- House district
- MN-6 119th Congress
- State
- Minnesota
- Time zone
- Central
- Land area
- 62.4 sq mi · 343 people per sq mi
Where is ZIP code 55309?
55309 centers on 45.379°, -93.733° and covers 62.4 square miles of land plus 3.3 of water. It borders 5 ZIP codes: 55308, 55362, 55330, 55398, 55371.
The map draws ZIP code areas only. For the streets inside 55309, 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 55309 compare with the rest of Sherburne County?
| Measure | 55309 | In Sherburne County | In MN |
|---|---|---|---|
| People (ACS 2020-2024) | 21,378 | 2nd of 7 | 87th of 881 |
| Median household income | $122k | 1st of 7 | 52nd of 545 |
| Median home value | $361k | 3rd of 7 | 122nd of 558 |
Its median household income is higher than in 91% of U.S. residential ZIP codes, and it is denser than 68% 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 55309?
The 2020 Census counted 20,387 people in 55309; the ACS, which samples households over 2020-2024, estimates 21,378. Between the 2010 and 2020 censuses its population grew 12.0% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 21,378
- 2020 Census count
- 20,387+12.0% since 2010 (18,208)
- Households
- 7,152
- Median age
- 36.0
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 55309?
Of the 21,378 people the ACS estimates in 55309, 27.2% are under 18 and 8.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (87.7%).
- Under 1827.2%
- 18 to 6464.4%
- 65 and older8.4%
- White, not Hispanic87.7%
- Hispanic or Latino4.7%
- Other or two or more3.6%
- Black, not Hispanic2.5%
- Asian, not Hispanic1.4%
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 55309 earn?
Median household income is $121,711 (ACS 2020-2024), the highest of the 7 ranked ZIP codes in Sherburne County. It rose from $110,086 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $121,711
- Income per person
- $48,185
- Below the poverty line
- 4.5%
- Unemployed (of the labor force)
- 2.8%
- Adults 25+ with a bachelor's degree
- 31.8%
- Adjusted gross income per tax return, 2022
- $82,25010,400 returns; wages 80% 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 55309?
FHFA's house price index for 55309, built from repeat sales and appraisals of the same homes, rose 92% from 2015 to 2025 and rose 43% from 2020 to 2025, and moved +4.2% in 2025.
- Median home value (owners' estimate)
- $361,100
- Median gross rent
- $1,408
- Homes owned by their occupants
- 90.6%
- Housing units
- 7,506
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 55309?
395 business establishments had a location in this ZIP code in 2023, 24 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction92
- Other services (except public administration)50
- Health care and social assistance38
- Retail trade35
- Professional, scientific, and technical services26
- Administrative and support and waste management and remediation services26
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 55309?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 55308 | Becker | 10,321 | $107k | 5.5 mi |
| 55362 | Monticello | 20,663 | $92k | 7.8 mi |
| 55330 | Elk River | 45,721 | $116k | 8.7 mi |
| 55398 | Zimmerman | 17,688 | $103k | 8.9 mi |
| 55371 | Princeton | 18,103 | $94k | 15.3 mi |
| 55301 | Albertville | 13,482 | $129k | 9.9 mi (near) |
| 55376 | Saint Michael | 20,106 | $131k | 11.9 mi (near) |
| 55319 | Clear Lake | 5,185 | $112k | 12.4 mi (near) |
| 55313 | Buffalo | 24,913 | $93k | 15.2 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.