Data Last Updated: July 1, 2025

Flathead County, MT ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Flathead, MT.	21 ZIP Codes (11 General, 7 PO Box, 0 Unique, & 3 Multi County) [More Details]
Area Code: The Telephone Area Code that are associated with Flathead, MT. 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.	406
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.	Mountain
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 Flathead, MT 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.	104,357 [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.	30029
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.	Kalispell, MT
Land Area: The approximate amount of land area covered by Flathead, MT 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.	5,087 square miles
Water Area: The approximate amount of water area covered by Flathead, MT 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.	169 square miles
Coordinates: The latitude/longitude centroid coordinates for Flathead County, MT.	-114.049665, 48.295145
Quick Link: Copy the direct link to the Flathead, MTCounty page and use anywhere you like!	https://www.zip-codes.com/county/mt-flathead.asp

Flathead, MT ZIP Code Boundaries

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Flathead County, MT Covers 21 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 59845 *	General	Hot Springs	1,254	--
ZIP Code 59901	General	Kalispell	57,900	55.48%
ZIP Code 59903	P.O. Box	Kalispell	0	0.00%
ZIP Code 59904	P.O. Box	Kalispell	0	0.00%
ZIP Code 59911	General	Bigfork	8,722	8.36%
ZIP Code 59912	General	Columbia Falls	15,395	14.75%
ZIP Code 59913	P.O. Box	Coram	727	0.70%
ZIP Code 59914 *	General	Dayton	377	--
ZIP Code 59916	General	Essex	188	0.18%
ZIP Code 59919	P.O. Box	Hungry Horse	828	0.79%
ZIP Code 59920	General	Kila	1,880	1.80%
ZIP Code 59922	General	Lakeside	2,643	2.53%
ZIP Code 59925	General	Marion	1,633	1.56%
ZIP Code 59926	General	Martin City	439	0.42%
ZIP Code 59927	P.O. Box	Olney	413	0.40%
ZIP Code 59928	General	Polebridge	171	0.16%
ZIP Code 59931 *	General	Rollins	297	--
ZIP Code 59932	General	Somers	1,558	1.49%
ZIP Code 59936	P.O. Box	West Glacier	392	0.38%
ZIP Code 59937	General	Whitefish	14,354	13.75%

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

Important Flathead, MT Information

Flathead County, MT Covers 21 ZIP Codes. This includes 11 General ZIP Codes, 7 PO Box ZIP Codes, and 0 Unique (reserved for Business and Volume Mail Receivers). There are also 3 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Flathead County.

The population for Flathead County is 104,357, according to the U.S. Census. Population Density is 20.51 persons per square mile. With 49,875 Housing Units, the Average Household Size is 2.43 persons. There are 42,481 Family Households with an Average Family Size of 2.87 persons. 8.00% of the population is without Health Insurance. The 60.76% Employment Rate is 0.96% above the national average of 59.8%.77,668 people aged 25+ have some educational achievement, with 36.03% (or 27,987 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

406 is the only area code for this area. Flathead is also located in the Mountain timezone and the current local time is shown above.

Flathead is part of the Kalispell, MT Core Based Statistical Area (CBSA). Its CBSA Code is 28060.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 Flathead, MT have 47,269 Residential mailboxes and 3,497 Business mailboxes.There are 5,068 businesses with a total of 44,198 employees. That is an average of 8.7 employees per business. Annual payroll for these businesses is $2,145,263,000. Other Demographics

Flathead County Demographic Profile

Population & People

Total Population

104,357

Income

Median Household Income

$71,327

Housing

Total Housing Units

49,875

Health

Without Healthcare Coverage

8.00%

Business & Economy

Total Businesses

5,068

Families

Total Households

42,481

Employment

Employment Rate

60.76%

Education

Bachelor's Degree or Higher

36.03%

Total Population: Total number of people from the 2020 U.S. Census for Flathead, MT. 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.	104,357
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Flathead, MT. 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.	114,275
Total Households: Total number of Households from the 2020 U.S. Census for Flathead, MT. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	42,481
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.	49,875
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.	2.43
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.	2.87

Other Flathead Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	47,269
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	3,497
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.	78,181
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	24,674
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	1,490

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	5,068
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$470,811,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$2,145,263,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	44,198

Sum of all ZIP Codes assigned Flathead, MT 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