Data Last Updated: July 1, 2025

Lake County, IN ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Lake, IN.	34 ZIP Codes (25 General, 7 PO Box, 0 Unique, & 2 Multi County) [More Details]
Area Code: The Telephone Area Code that are associated with Lake, IN. 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.	219
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 Lake, IN 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.	498,700 [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.	18089
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.	Chicago-Naperville-Elgin, IL-IN
Land Area: The approximate amount of land area covered by Lake, IN 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.	499 square miles
Water Area: The approximate amount of water area covered by Lake, IN 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.	128 square miles
Coordinates: The latitude/longitude centroid coordinates for Lake County, IN.	-87.382142, 41.416731
Quick Link: Copy the direct link to the Lake, INCounty page and use anywhere you like!	https://www.zip-codes.com/county/in-lake.asp

Lake, IN ZIP Code Boundaries

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Lake County, IN Covers 34 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 46303	General	Cedar Lake	17,028	3.41%
ZIP Code 46307	General	Crown Point	69,248	13.89%
ZIP Code 46308	P.O. Box	Crown Point	0	0.00%
ZIP Code 46311	General	Dyer	22,431	4.50%
ZIP Code 46312	General	East Chicago	26,370	5.29%
ZIP Code 46319	General	Griffith	18,108	3.63%
ZIP Code 46320	General	Hammond	14,514	2.91%
ZIP Code 46321	General	Munster	23,894	4.79%
ZIP Code 46322	General	Highland	23,984	4.81%
ZIP Code 46323	General	Hammond	22,510	4.51%
ZIP Code 46324	General	Hammond	22,611	4.53%
ZIP Code 46325	P.O. Box	Hammond	0	0.00%
ZIP Code 46327	General	Hammond	11,078	2.22%
ZIP Code 46341 *	General	Hebron	10,518	--
ZIP Code 46342	General	Hobart	32,540	6.52%
ZIP Code 46355	P.O. Box	Leroy	0	0.00%
ZIP Code 46356	General	Lowell	18,668	3.74%
ZIP Code 46368 *	General	Portage	39,837	--
ZIP Code 46373	General	Saint John	17,839	3.58%
ZIP Code 46375	General	Schererville	24,051	4.82%
ZIP Code 46376	P.O. Box	Schneider	367	0.07%
ZIP Code 46377	P.O. Box	Shelby	194	0.04%
ZIP Code 46394	General	Whiting	11,725	2.35%
ZIP Code 46401	P.O. Box	Gary	0	0.00%
ZIP Code 46402	General	Gary	5,502	1.10%
ZIP Code 46403	General	Gary	11,649	2.34%
ZIP Code 46404	General	Gary	15,658	3.14%
ZIP Code 46405	General	Lake Station	11,860	2.38%
ZIP Code 46406	General	Gary	8,776	1.76%
ZIP Code 46407	General	Gary	9,862	1.98%
ZIP Code 46408	General	Gary	15,109	3.03%
ZIP Code 46409	General	Gary	6,975	1.40%
ZIP Code 46410	General	Merrillville	39,471	7.91%
ZIP Code 46411	P.O. Box	Merrillville	0	0.00%

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

Important Lake, IN Information

Lake County, IN Covers 34 ZIP Codes. This includes 25 General ZIP Codes, 7 PO Box ZIP Codes, and 0 Unique (reserved for Business and Volume Mail Receivers). There are also 2 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Lake County.

The population for Lake County is 498,700, according to the U.S. Census. Population Density is 999.40 persons per square mile. With 214,775 Housing Units, the Average Household Size is 2.53 persons. There are 195,090 Family Households with an Average Family Size of 3.29 persons. 6.04% of the population is without Health Insurance. The 57.34% Employment Rate is 2.46% above the national average of 59.8%.340,958 people aged 25+ have some educational achievement, with 24.90% (or 84,885 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

219 is the only area code for this area. Lake is also located in the Central timezone and the current local time is shown above.

Lake is part of the Chicago-Naperville-Elgin, IL-IN Core Based Statistical Area (CBSA). Its CBSA Code is 16980.It is classified as a metro area, which means the combined population is 50,000 or more (at its core).

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more (for a micro area) 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 Lake, IN have 205,601 Residential mailboxes and 12,058 Business mailboxes.There are 10,502 businesses with a total of 167,447 employees. That is an average of 15.9 employees per business. Annual payroll for these businesses is $9,432,246,000. Other Demographics

Lake County Demographic Profile

Population & People

Total Population

498,700

Income

Median Household Income

$68,985

Housing

Total Housing Units

214,775

Health

Without Healthcare Coverage

6.04%

Business & Economy

Total Businesses

10,502

Families

Total Households

195,090

Employment

Employment Rate

57.34%

Education

Bachelor's Degree or Higher

24.90%

Total Population: Total number of people from the 2020 U.S. Census for Lake, IN. 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.	498,700
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Lake, IN. 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.	521,922
Total Households: Total number of Households from the 2020 U.S. Census for Lake, IN. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	195,090
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.	214,775
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.	2.53
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.	3.29

Other Lake Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	205,601
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	12,058
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.	237,112
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	169,717
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	20,975

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	10,502
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$2,255,361,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$9,432,246,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	167,447

Sum of all ZIP Codes assigned Lake, IN 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