Table 1.  The Most Populous Counties and Incorporated Places in 2010 in Montana:  2000 and 2010
(For information on confidentiality protection, nonsampling error, and definitions, see http://www.census.gov/prod/cen2010/pl94-171.pdf)
Population rank     Population Change, 2000 to 2010
             
2010 2000   Geographic area 2000 1 2010 Number Percent
             
    Montana………...……………………………………………….  902 195  989 415  87 220 9.7
             
    COUNTY        
             
1 1   Yellowstone County…………………………………………….  129 352  147 972  18 620 14.4
2 2   Missoula County……………………………………………..  95 802  109 299  13 497 14.1
3 4   Flathead County……………………………………………….  74 471  90 928  16 457 22.1
4 5   Gallatin County……………………………………………….  67 831  89 513  21 682 32.0
5 3   Cascade County………………………………………………  80 357  81 327   970 1.2
6 6   Lewis and Clark County…………………………………………..  55 716  63 395  7 679 13.8
7 7   Ravalli County……………………………………………….  36 070  40 212  4 142 11.5
8 8   Silver Bow County 2………………………………………………….  34 606  34 200 -  406 -1.2
9 9   Lake County…………………………………………………..  26 507  28 746  2 239 8.4
10 10   Lincoln County………………………………………………..  18 837  19 687   850 4.5
11 11   Hill County………………………………………………….  16 673  16 096 -  577 -3.5
12 12   Park County…………………………………………………..  15 694  15 636 -  58 -0.4
13 13   Glacier County……………………………………………….  13 247  13 399   152 1.1
14 14   Big Horn County………………………………………………  12 671  12 865   194 1.5
15 16   Custer County………………………………………………..  11 696  11 699   3 -
16 15   Fergus County………………………………………………..  11 893  11 586 -  307 -2.6
17 18   Sanders County………………………………………………  10 227  11 413  1 186 11.6
18 19   Jefferson County………………………………………………..  10 049  11 406  1 357 13.5
19 17   Roosevelt County………………………………………………..  10 620  10 425 -  195 -1.8
20 21   Carbon County………………………………………………….  9 552  10 078   526 5.5
             
    INCORPORATED PLACE        
             
1 1   Billings city……………………………………………………  89 847  104 170  14 323 15.9
2 2   Missoula city…………………………………………………..  57 053  66 788  9 735 17.1
3 3   Great Falls city………………………………………………..  56 690  58 505  1 815 3.2
4 5   Bozeman city………………………………………………….  27 509  37 280  9 771 35.5
5 4   Butte-Silver Bow 2…………………………………………………….  34 606  34 200 -  406 -1.2
6 6   Helena city…………………………………………………….  25 780  28 190  2 410 9.3
7 7   Kalispell city……………………………………………………  14 223  19 927  5 704 40.1
8 8   Havre city………………………………………………………  9 621  9 310 -  311 -3.2
9 9   Anaconda-Deer Lodge County………………………………………  9 417  9 298 -  119 -1.3
10 10   Miles City city……………………………………………………  8 487  8 410 -  77 -0.9
11 14   Belgrade city…………………………………………………..  5 728  7 389  1 661 29.0
12 11   Livingston city…………………………………………………….  6 851  7 044   193 2.8
13 12   Laurel city……………………………………………………….  6 255  6 718   463 7.4
14 15   Whitefish city……………………………………………………  5 032  6 357  1 325 26.3
15 13   Lewistown city………………………………………………….  5 813  5 901   88 1.5
16 16   Sidney city…………………………………………………….  4 774  5 191   417 8.7
17 17   Glendive city……………………………………………………..  4 729  4 935   206 4.4
18 21   Columbia Falls city…………………………………………….  3 645  4 688  1 043 28.6
19 18   Polson city…………………………………………………  4 041  4 488   447 11.1
20 20   Hamilton city……………………………………………………  3 705  4 348   643 17.4
               
 -  Represents zero or rounds to 0.0.
1 Census 2000 counts are as published in Census 2000 reports and thus do not include any changes published subsequently due to boundary changes or to the Count Question Resolution program.
2 Silver Bow County and the incorporated place of Butte-Silver Bow are coextensive.
Source:  U.S. Census Bureau, Census 2000 Redistricting Data (Public Law 94-171) Summary File, Table PL1, and 2010 Census Redistricting Data (Public Law 94-171) Summary File, Table P1.