Table 1.  The Most Populous Counties and Incorporated Places in 2010 in Ohio:  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
             
    Ohio………...………………………………………………. 11 353 140 11 536 504  183 364 1.6
             
    COUNTY        
             
1 1   Cuyahoga County……………………………………………. 1 393 978 1 280 122 - 113 856 -8.2
2 2   Franklin County……………………………………………. 1 068 978 1 163 414  94 436 8.8
3 3   Hamilton County………………………………………….  845 303  802 374 - 42 929 -5.1
4 5   Summit County…………………………………………….  542 899  541 781 - 1 118 -0.2
5 4   Montgomery County………………………………………  559 062  535 153 - 23 909 -4.3
6 6   Lucas County……………………………………………….  455 054  441 815 - 13 239 -2.9
7 7   Stark County……………………………………………….  378 098  375 586 - 2 512 -0.7
8 8   Butler County………………………………………………  332 807  368 130  35 323 10.6
9 9   Lorain County………………………………………………  284 664  301 356  16 692 5.9
10 10   Mahoning County…………………………………………….  257 555  238 823 - 18 732 -7.3
11 11   Lake County……………………………………………………  227 511  230 041  2 530 1.1
12 14   Warren County……………………………………………..  158 383  212 693  54 310 34.3
13 12   Trumbull County………………………………………………  225 116  210 312 - 14 804 -6.6
14 13   Clermont County…………………………………………..  177 977  197 363  19 386 10.9
15 25   Delaware County…………………………………………….  109 989  174 214  64 225 58.4
16 16   Medina County…………………………………………….  151 095  172 332  21 237 14.1
17 18   Licking County…………………………………………..  145 491  166 492  21 001 14.4
18 17   Greene County………………………………………………..  147 886  161 573  13 687 9.3
19 15   Portage County…………………………………………….  152 061  161 419  9 358 6.2
20 21   Fairfield County………………………………………………  122 759  146 156  23 397 19.1
             
    INCORPORATED PLACE        
             
1 1   Columbus city………………………………………………  711 470  787 033  75 563 10.6
2 2   Cleveland city………………………………………………  478 403  396 815 - 81 588 -17.1
3 3   Cincinnati city………………………………………………  331 285  296 943 - 34 342 -10.4
4 4   Toledo city……………………………………………………  313 619  287 208 - 26 411 -8.4
5 5   Akron city…………………………………………………..  217 074  199 110 - 17 964 -8.3
6 6   Dayton city………………………………………………….  166 179  141 527 - 24 652 -14.8
7 7   Parma city…………………………………………………..  85 655  81 601 - 4 054 -4.7
8 9   Canton city…………………………………………………  80 806  73 007 - 7 799 -9.7
9 8   Youngstown city……………………………………………  82 026  66 982 - 15 044 -18.3
10 10   Lorain city…………………………………………………..  68 652  64 097 - 4 555 -6.6
11 12   Hamilton city………………………………………………..  60 690  62 477  1 787 2.9
12 11   Springfield city…………………………………………………  65 358  60 608 - 4 750 -7.3
13 13   Kettering city……………………………………………….  57 502  56 163 - 1 339 -2.3
14 15   Elyria city……………………………………………………  55 953  54 533 - 1 420 -2.5
15 14   Lakewood city……………………………………………….  56 646  52 131 - 4 515 -8.0
16 20   Cuyahoga Falls city………………………………………………………….  49 374  49 652   278 0.6
17 16   Euclid city……………………………………………………  52 717  48 920 - 3 797 -7.2
18 17   Middletown city……………………………………………….  51 605  48 694 - 2 911 -5.6
19 21   Mansfield city………………………………………………….  49 346  47 821 - 1 525 -3.1
20 23   Newark city……………………………………………………  46 279  47 573  1 294 2.8
               
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.
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.