Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — PREFIX/599

ZIP codes starting with 599

ZIP codes
30
States
MT
Largest city
Kalispell, MT
Population
136,979

The first three digits of a ZIP code identify a sectional center facility — the postal processing plant that sorts mail for the area. It is a mail-routing grouping, not an administrative boundary.

Every ZIP code in 599xx

ZIP codes starting with 599
ZIP City Type Population Median income Median home
59901 Kalispell , MT Standard 63,161 $72,523 $476,300
59903 Kalispell , MT No street area — — —
59904 Kalispell , MT No street area — — —
59910 Big Arm , MT Standard 692 $99,886 $588,500
59911 Bigfork , MT Standard 9,493 $83,019 $666,400
59912 Columbia Falls , MT Standard 15,752 $76,617 $488,800
59913 Coram , MT Standard 582 $44,464 $560,100
59914 Dayton , MT Standard 345 $83,750 $1,214,300
59915 Elmo , MT Standard 452 $58,750 —
59916 Essex , MT Standard 232 $60,250 $390,000
59917 Eureka , MT Standard 4,920 $50,139 $360,100
59918 Fortine , MT Standard 509 $67,250 $353,300
59919 Hungry Horse , MT Standard 679 $53,056 —
59920 Kila , MT Standard 1,704 $86,605 $722,500
59921 Lake Mc Donald , MT No street area — — —
59922 Lakeside , MT Standard 2,337 $87,237 $657,500
59923 Libby , MT Standard 10,450 $44,980 $272,000
59925 Marion , MT Standard 1,532 $63,981 $437,800
59926 Martin City , MT Standard 268 $70,948 $480,000
59927 Olney , MT Standard 270 $58,713 $445,700
59928 Polebridge , MT Standard 86 $63,333 $761,900
59929 Proctor , MT Standard 230 $101,250 —
59930 Rexford , MT Standard 1,220 $61,923 $287,400
59931 Rollins , MT Standard 335 $112,083 $742,600
59932 Somers , MT Standard 1,850 $60,152 $768,600
59933 Stryker , MT Standard 2 — —
59934 Trego , MT Standard 693 $108,875 $330,800
59935 Troy , MT Standard 3,381 $39,712 $371,400
59936 West Glacier , MT Standard 690 $85,455 $532,300
59937 Whitefish , MT Standard 15,114 $75,428 $698,200

Cite this page

zipcodes.pro. “ZIP codes starting with 599.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/prefix/599

Underlying data is public domain or openly licensed — sources, vintages and licences.