Below you'll find
- a map showing the county and all of its municipalities,
- a table showing the population and size of each municipality.

| Municipality | Pop. 1990 | Pop. 2000 | Km2/miles2 |
|---|---|---|---|
| 1901 Harstad | 22 384 | 23 025 | 364/141 |
| 1902 Tromsø | 50 548 | 59 145 | 2 558/988 |
| 1911 Kvæfjord | 3 425 | 3 287 | 522/202 |
| 1913 Skånland | 3 409 | 3 109 | 494/191 |
| 1915 Bjarkøy | 723 | 602 | 75/29 |
| 1917 Ibestad | 2 229 | 1 763 | 242/93 |
| 1919 Gratangen | 1 483 | 1 345 | 313/121 |
| 1920 Lavangen | 1 149 | 1 052 | 304/117 |
| 1922 Bardu | 3 890 | 3 889 | 2 6981 041 |
| 1923 Salangen | 2 586 | 2 346 | 457/176 |
| 1924 Målselv | 7 420 | 7 054 | 3 322/1282 |
| 1925 Sørreisa | 3 438 | 3 294 | 361/139 |
| 1926 Dyrøy | 1 587 | 1 337 | 290/112 |
| 1927 Tranøy | 1 992 | 1 695 | 523/202 |
| 1928 Torsken | 1 310 | 1 166 | 246/95 |
| 1929 Berg | 1 224 | 1 111 | 288/111 |
| 1931 Lenvik | 10 899 | 11 039 | 895/346 |
| 1933 Balsfjord | 6 378 | 5 749 | 1 494/577 |
| 1936 Karlsøy | 2 774 | 2 496 | 1 040/402 |
| 1938 Lyngen | 3 557 | 3 225 | 810/313 |
| 1939 Storfjord | 1 836 | 1 872 | 1 538/593 |
| 1940 Gáivuotna - Kåfjord | 2 857 | 2 369 | 997/385 |
| 1941 Skjervøy | 3 082 | 2 934 | 473/183 |
| 1942 Nordreisa | 4 697 | 4 821 | 3 435/1 326 |
| 1943 Kvænangen | 1 615 | 1 435 | 2 110/815 |