Data Last Updated: July 1, 2025

Lee County, IL ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Lee, IL.	23 ZIP Codes (11 General, 3 PO Box, 0 Unique, & 9 Multi County) [More Details]
Area Codes: The Telephone Area Codes that are associated with Lee, IL. Area Codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. There are approximately 350 area codes in use in the United States.	779, 815
Timezone: Time zone designation within the U.S. Please note that not all areas in the U.S. observe daylight saving time which can affect actual local time for this city. There are 7 standard time zones which are, from west to east: Hawaii-Aleutian, Alaska, Pacific, Mountain, Central, Eastern, Atlantic. Also included in U.S. Territories are Samoa, Guam and Palau.	Central
Local Time: The current local time for each timezone. If more than 1 time zone for this area, all local times will be shown. Counties can cross timezones, so more than 1 may be shown.	12:00:00 AM
Population: The population of Lee, IL from the U.S. Census 2020. Included are U.S. Citizens, permanent residents, temporary migrants, and undocumented individuals. The total population represents people who live in the city, not just those present while the Census was being completed.	34,145 [More Details]
FIPS: FIPS stands for Federal Information Processing Standards, which are a set of publicly announced standards for computer systems. A county FIPS code is a unique numeric identifier for a county in the United States, assigned by the National Institute of Standards and Technology (NIST). County FIPS codes have five digits, with the first two digits identifying the state and the last 3 indicating the county.	17103
CBSA: A Core Based Statistical Area (CBSA) is the recognized term for a region that functions around an urban core with a population of at least 10,000 people, according to the standards set by the Office of Management and Budget (OMB) in 2000. A CBSA is divided into two subsets: Metro and Micro, and these classifications are determined by population density. A Micro area is identified by a population ranging between 10,000 to 50,000, while a Metro area is defined as having a population that exceeds 50,000.	Dixon, IL
Land Area: The approximate amount of land area covered by Lee, IL in square miles. The Land Area provided by the Census Bureau is based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each city.	725 square miles
Water Area: The approximate amount of water area covered by Lee, IL in square miles. Calculations by the Census Bureau for Water Area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompasses features such as lakes, reservoirs, rivers, and coastal water bodies.	4 square miles
Coordinates: The latitude/longitude centroid coordinates for Lee County, IL.	-89.300306, 41.746114
Quick Link: Copy the direct link to the Lee, ILCounty page and use anywhere you like!	https://www.zip-codes.com/county/il-lee.asp

Lee, IL ZIP Code Boundaries

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Lee County, IL Covers 23 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 60518 *	General	Earlville	3,325	--
ZIP Code 60530	General	Lee	577	1.69%
ZIP Code 60553	General	Steward	703	2.06%
ZIP Code 61006	General	Ashton	1,640	4.80%
ZIP Code 61021	General	Dixon	22,984	67.31%
ZIP Code 61031	General	Franklin Grove	1,430	4.19%
ZIP Code 61042	General	Harmon	511	1.50%
ZIP Code 61057	P.O. Box	Nachusa	108	0.32%
ZIP Code 61064 *	General	Polo	3,693	--
ZIP Code 61068 *	General	Rochelle	14,653	--
ZIP Code 61071 *	General	Rock Falls	13,389	--
ZIP Code 61081 *	General	Sterling	21,064	--
ZIP Code 61310	General	Amboy	3,700	10.84%
ZIP Code 61318	General	Compton	620	1.82%
ZIP Code 61324	P.O. Box	Eldena	102	0.30%
ZIP Code 61330 *	General	La Moille	1,369	--
ZIP Code 61331	P.O. Box	Lee Center	34	0.10%
ZIP Code 61342 *	General	Mendota	8,648	--
ZIP Code 61349 *	General	Ohio	903	--
ZIP Code 61353	General	Paw Paw	1,207	3.53%
ZIP Code 61367	General	Sublette	691	2.02%
ZIP Code 61376 *	General	Walnut	2,022	--
ZIP Code 61378	General	West Brooklyn	518	1.52%

* Indicates a Multi County ZIP Code. These ZIP Codes partially cross over into Lee, IL, but will mostly cover area in a different County. Not included in % of Population calculations.

Important Lee, IL Information

Lee County, IL Covers 23 ZIP Codes. This includes 11 General ZIP Codes, 3 PO Box ZIP Codes, and 0 Unique (reserved for Business and Volume Mail Receivers). There are also 9 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Lee County.

The population for Lee County is 34,145, according to the U.S. Census. Population Density is 47.10 persons per square mile. With 14,985 Housing Units, the Average Household Size is 2.31 persons. There are 13,589 Family Households with an Average Family Size of 2.94 persons. 3.08% of the population is without Health Insurance. The 54.28% Employment Rate is 5.52% above the national average of 59.8%.25,024 people aged 25+ have some educational achievement, with 19.35% (or 4,843 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

There are 2 area codes serving this area including779 and 815. Lee is also located in the Central timezone and the current local time is shown above.

Lee is part of the Dixon, IL Core Based Statistical Area (CBSA). Its CBSA Code is 19940.It is classified as a micro area, which means it has an urban core of at least 10,000 but less then 50,000 people.

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more and adjacent territory with a high degree of social and economic integration. CBSA codes are commonly used to accurately file Medicare claims and to verify applicable incentives using a patient's ZIP Code.

ZIP Codes in Lee, IL have 13,644 Residential mailboxes and 791 Business mailboxes.There are 705 businesses with a total of 9,984 employees. That is an average of 14.2 employees per business. Annual payroll for these businesses is $499,179,000. Other Demographics

Lee County Demographic Profile

Population & People

Total Population

34,145

Income

Median Household Income

$68,459

Housing

Total Housing Units

14,985

Health

Without Healthcare Coverage

3.08%

Business & Economy

Total Businesses

705

Families

Total Households

13,589

Employment

Employment Rate

54.28%

Education

Bachelor's Degree or Higher

19.35%

Total Population: Total number of people from the 2020 U.S. Census for Lee, IL. This reflects the exact count of this area at that point in time, not future estimates, regardless of citizenship or immigration status. It is intended to count all persons living within the geographic area, not just those present on the day of the census.	34,145
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Lee, IL. This is derived from known delivery information, household occupancy rates, household size, and more to come up with an accurate estimation for the current population. IMPORTANT: This does not include population totals for persons in nursing homes, correctional facilities, or other institutions. This is an estimation of the household population based on US Postal Service delivery information.	31,368
Total Households: Total number of Households from the 2020 U.S. Census for Lee, IL. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	13,589
Total Housing Units: The total number of Housing Units is the number of occupied units + the number of vacant units. Ownership is defined by whether the unit is occupied by an owner or by a tenant. Owner occupancy means that the owner lives in the unit. This value comes from the 2020 U.S. Census and is not a projection or estimate.	14,985
Average Household Size: The Average Household Size, is obtained by dividing the number of people in Households (excluding those in group quarters, nursing home, prisons, and dorm rooms) by the number of Households. A Household includes everyone living in a residential unit. Those who do not live in a household are classified as living in group accommodation. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.31
Average Family Size: Average Family Size is calculated by dividing the number of people in a Family Household by the number of Family Households. The U.S. Census Bureau defines family households as households consisting of two or more individuals who are related by birth, marriage, or adoption. They also may include other unrelated people. Non-family households consist of people who live alone or who share their residence with unrelated individuals. The Average Family Size only looks at the households classified as Family Households. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.94

Other Lee Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	13,644
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	791
Total Delivery Receptacles: The total number of delivery receptacles. This includes curb side mailboxes, centralized units, PO Boxes, NDCBU, and contract boxes. This count is for Residential and Business combined.	18,219
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	12,063
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	656

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	705
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$121,975,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$499,179,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	9,984

Sum of all ZIP Codes assigned Lee, IL as their primary County.

References

U.S. Postal Service [Last Updated: 7/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 7/1/2025], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023], https://www.census.gov