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(Links below lead to Quick Facts for New York Counties: People, Business & Geography at U.S. Census Bureau.)
| Area | 7/1/2009 | 7/1/2008 | 7/1/2007 | 7/1/2006 | 7/1/2005 | 7/1/2004 | 7/1/2003 | 7/1/2002 | 7/1/2001 | 7/1/2000 | Census 2000 |
| New York | 19,541,453 | 19,467,789 | 19,422,777 | 19,356,564 | 19,330,891 | 19,297,933 | 19,231,101 | 19,161,873 | 19,088,978 | 18,998,044 | 18,976,457 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Albany County | 298,284 | 297,537 | 298,246 | 299,033 | 298,605 | 298,819 | 298,491 | 296,644 | 295,378 | 294,960 | 294,565 |
| Allegany County | 49,157 | 49,370 | 49,183 | 49,423 | 49,824 | 50,397 | 50,220 | 50,103 | 50,175 | 49,916 | 49,927 |
| Bronx County | 1,397,287 | 1,389,315 | 1,385,122 | 1,371,353 | 1,364,566 | 1,359,139 | 1,353,712 | 1,348,285 | 1,341,319 | 1,333,854 | 1,332,650 |
| Broome County | 194,630 | 194,635 | 194,978 | 195,700 | 196,103 | 197,463 | 198,364 | 199,714 | 199,999 | 200,319 | 200,536 |
| Cattaraugus County | 79,689 | 79,835 | 80,253 | 80,578 | 81,389 | 82,366 | 82,968 | 83,126 | 83,297 | 84,017 | 83,955 |
| Cayuga County | 79,526 | 79,755 | 79,932 | 80,225 | 80,532 | 80,843 | 81,073 | 81,240 | 81,275 | 81,925 | 81,963 |
| Chautauqua County | 133,503 | 133,595 | 134,014 | 134,279 | 134,998 | 136,273 | 136,904 | 137,989 | 138,594 | 139,659 | 139,750 |
| Chemung County | 88,331 | 87,902 | 88,058 | 88,164 | 88,351 | 89,366 | 89,816 | 90,409 | 90,673 | 91,079 | 91,070 |
| Chenango County | 50,620 | 50,937 | 51,132 | 51,097 | 50,994 | 51,113 | 51,254 | 51,166 | 51,098 | 51,381 | 51,401 |
| Clinton County | 81,618 | 81,699 | 81,865 | 81,905 | 81,690 | 81,380 | 81,066 | 80,525 | 80,248 | 79,897 | 79,894 |
| Columbia County | 61,618 | 61,961 | 62,284 | 62,383 | 62,839 | 62,933 | 62,782 | 62,847 | 62,808 | 63,055 | 63,094 |
| Cortland County | 47,996 | 48,131 | 48,313 | 48,279 | 48,315 | 48,780 | 48,802 | 48,410 | 48,601 | 48,571 | 48,599 |
| Delaware County | 45,514 | 45,938 | 46,287 | 46,413 | 46,820 | 47,055 | 47,011 | 47,099 | 47,537 | 47,967 | 48,055 |
| Dutchess County | 293,562 | 292,500 | 291,815 | 291,471 | 291,586 | 290,637 | 289,088 | 286,769 | 284,315 | 281,001 | 280,150 |
| Erie County | 909,247 | 909,858 | 911,784 | 916,292 | 923,820 | 932,002 | 936,931 | 940,645 | 945,165 | 949,494 | 950,265 |
| Essex County | 37,686 | 37,740 | 37,856 | 38,156 | 38,197 | 38,389 | 38,626 | 38,717 | 38,629 | 38,822 | 38,851 |
| Franklin County | 50,274 | 50,440 | 50,482 | 50,371 | 50,305 | 50,427 | 50,654 | 50,558 | 50,787 | 51,049 | 51,134 |
| Fulton County | 55,053 | 55,122 | 55,075 | 54,937 | 54,969 | 54,976 | 54,881 | 54,874 | 54,866 | 55,006 | 55,073 |
| Genesee County | 57,868 | 57,950 | 58,159 | 58,362 | 58,701 | 59,096 | 59,506 | 59,647 | 59,892 | 60,329 | 60,370 |
| Greene County | 48,947 | 49,106 | 49,170 | 49,215 | 48,917 | 48,630 | 48,361 | 48,226 | 48,077 | 48,143 | 48,195 |
| Hamilton County | 4,923 | 4,959 | 5,016 | 5,029 | 5,128 | 5,188 | 5,207 | 5,252 | 5,326 | 5,383 | 5,379 |
| Herkimer County | 62,236 | 62,293 | 62,433 | 62,358 | 62,873 | 63,198 | 63,208 | 63,388 | 63,955 | 64,383 | 64,427 |
| Jefferson County | 118,719 | 117,157 | 117,957 | 117,162 | 116,982 | 114,424 | 113,353 | 113,936 | 111,841 | 111,494 | 111,738 |
| Kings County | 2,567,098 | 2,549,941 | 2,539,206 | 2,523,047 | 2,511,408 | 2,497,859 | 2,483,164 | 2,477,380 | 2,471,596 | 2,465,812 | 2,465,326 |
| Lewis County | 26,157 | 26,030 | 26,322 | 26,319 | 26,199 | 26,219 | 26,353 | 26,411 | 26,824 | 26,966 | 26,944 |
| Livingston County | 62,871 | 63,067 | 63,123 | 63,254 | 63,497 | 63,941 | 63,880 | 64,194 | 64,455 | 64,361 | 64,328 |
| Madison County | 69,954 | 70,092 | 70,049 | 69,719 | 69,527 | 69,855 | 69,828 | 69,491 | 69,446 | 69,420 | 69,441 |
| Monroe County | 733,703 | 731,543 | 730,629 | 730,458 | 731,773 | 735,691 | 737,420 | 738,876 | 738,664 | 739,047 | 735,343 |
| Montgomery County | 48,616 | 48,623 | 48,606 | 48,681 | 48,634 | 48,768 | 48,938 | 49,006 | 49,336 | 49,653 | 49,708 |
| Nassau County | 1,357,429 | 1,353,151 | 1,353,061 | 1,351,870 | 1,355,194 | 1,356,589 | 1,353,565 | 1,349,668 | 1,342,896 | 1,336,290 | 1,334,544 |
| New York County | 1,629,054 | 1,631,599 | 1,625,251 | 1,612,630 | 1,606,275 | 1,590,911 | 1,578,815 | 1,567,241 | 1,562,335 | 1,540,373 | 1,537,195 |
| Niagara County | 214,557 | 214,197 | 214,181 | 214,621 | 215,508 | 216,712 | 217,281 | 217,723 | 218,363 | 219,665 | 219,846 |
| Oneida County | 231,044 | 230,540 | 230,948 | 231,052 | 231,563 | 232,484 | 232,578 | 233,014 | 233,697 | 235,045 | 235,469 |
| Onondaga County | 454,753 | 453,373 | 452,944 | 453,533 | 454,625 | 456,432 | 457,139 | 457,085 | 457,339 | 457,907 | 458,336 |
| Ontario County | 105,650 | 104,782 | 103,834 | 103,455 | 103,302 | 102,656 | 102,119 | 101,539 | 100,791 | 100,289 | 100,224 |
| Orange County | 383,532 | 379,520 | 376,226 | 373,386 | 370,074 | 367,562 | 362,609 | 355,221 | 348,896 | 343,155 | 341,367 |
| Orleans County | 42,051 | 42,246 | 42,370 | 42,511 | 42,723 | 43,119 | 43,201 | 43,399 | 43,681 | 44,147 | 44,171 |
| Oswego County | 121,377 | 121,551 | 121,444 | 121,592 | 121,978 | 122,802 | 122,712 | 122,278 | 122,176 | 122,490 | 122,377 |
| Otsego County | 61,602 | 61,811 | 62,194 | 62,348 | 62,474 | 62,426 | 62,126 | 61,776 | 61,680 | 61,669 | 61,676 |
| Putnam County | 99,265 | 99,090 | 99,012 | 98,958 | 99,228 | 99,204 | 98,738 | 98,187 | 97,000 | 96,079 | 95,745 |
| Queens County | 2,306,712 | 2,288,574 | 2,277,779 | 2,264,661 | 2,256,576 | 2,250,718 | 2,244,238 | 2,239,457 | 2,234,676 | 2,229,895 | 2,229,379 |
| Rensselaer County | 155,541 | 155,751 | 155,294 | 154,719 | 153,909 | 153,791 | 152,881 | 152,206 | 152,253 | 152,627 | 152,538 |
| Richmond County | 491,730 | 487,365 | 482,854 | 478,876 | 475,014 | 471,313 | 466,789 | 460,386 | 453,211 | 445,414 | 443,728 |
| Rockland County | 300,173 | 298,747 | 297,005 | 295,927 | 294,636 | 292,625 | 290,614 | 290,035 | 288,602 | 287,455 | 286,753 |
| Saratoga County | 220,069 | 217,958 | 216,259 | 214,925 | 213,245 | 211,745 | 209,711 | 206,672 | 204,104 | 201,570 | 200,635 |
| Schenectady County | 152,169 | 151,252 | 150,288 | 149,973 | 148,687 | 147,707 | 146,967 | 146,612 | 145,997 | 146,481 | 146,555 |
| Schoharie County | 31,529 | 31,803 | 31,932 | 31,891 | 31,911 | 31,866 | 31,691 | 31,618 | 31,758 | 31,589 | 31,582 |
| Schuyler County | 18,720 | 18,868 | 18,923 | 18,931 | 19,037 | 19,176 | 19,261 | 19,268 | 19,252 | 19,281 | 19,224 |
| Seneca County | 34,049 | 34,060 | 34,276 | 34,201 | 34,318 | 34,640 | 34,712 | 34,730 | 34,635 | 33,343 | 33,342 |
| St. Lawrence County | 109,715 | 109,553 | 109,594 | 109,769 | 110,072 | 110,224 | 110,381 | 110,686 | 111,202 | 111,869 | 111,931 |
| Steuben County | 96,552 | 96,452 | 96,430 | 96,648 | 97,287 | 97,735 | 98,253 | 98,996 | 98,935 | 98,776 | 98,726 |
| Suffolk County | 1,518,475 | 1,513,435 | 1,511,732 | 1,507,211 | 1,504,285 | 1,499,838 | 1,486,783 | 1,468,240 | 1,448,987 | 1,423,512 | 1,419,369 |
| Sullivan County | 75,828 | 75,969 | 76,403 | 75,828 | 75,591 | 75,351 | 74,774 | 74,063 | 74,004 | 74,236 | 73,966 |
| Tioga County | 50,064 | 50,235 | 50,402 | 50,463 | 50,673 | 50,874 | 51,281 | 51,576 | 51,449 | 51,723 | 51,784 |
| Tompkins County | 101,779 | 101,027 | 100,413 | 99,997 | 99,698 | 99,747 | 99,203 | 98,393 | 97,575 | 96,662 | 96,501 |
| Ulster County | 181,440 | 181,722 | 181,530 | 181,551 | 181,305 | 180,950 | 180,223 | 179,721 | 178,272 | 177,831 | 177,749 |
| Warren County | 66,021 | 65,926 | 65,804 | 65,641 | 65,322 | 64,741 | 64,490 | 63,979 | 63,570 | 63,364 | 63,303 |
| Washington County | 62,753 | 62,727 | 62,577 | 62,303 | 62,070 | 61,979 | 61,374 | 61,022 | 61,087 | 60,984 | 61,042 |
| Wayne County | 91,291 | 91,517 | 91,529 | 91,780 | 92,175 | 92,612 | 93,054 | 93,112 | 93,478 | 93,751 | 93,765 |
| Westchester County | 955,962 | 949,835 | 946,563 | 945,172 | 947,719 | 947,121 | 944,440 | 941,747 | 935,294 | 925,505 | 923,459 |
| Wyoming County | 41,398 | 41,549 | 41,841 | 42,056 | 42,257 | 42,439 | 42,636 | 42,791 | 42,972 | 43,364 | 43,424 |
| Yates County | 24,482 | 24,573 | 24,535 | 24,422 | 24,618 | 24,617 | 24,601 | 24,505 | 24,635 | 24,740 | 24,621 |
Source: Population Division, U.S. Census Bureau