| Estimates of Resident Population by Municipality: Union County, 2000-2005 | |||||||||||
| FIPS | FIPS | Census 2000 count | Estimates as of July 1, | ||||||||
| County | MCD | County/Municipality | Original | Corrected | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | |
| 039 | 00000 | Union County | 522,541 | 522,541 | 523,321 | 526,922 | 529,465 | 530,470 | 530,846 | 531,457 | |
| 039 | 05320 | Berkeley Heights township | 13,407 | 13,407 | 13,426 | 13,515 | 13,579 | 13,614 | 13,591 | 13,571 | |
| 039 | 13150 | Clark township | 14,597 | 14,597 | 14,612 | 14,685 | 14,744 | 14,739 | 14,679 | 14,635 | |
| 039 | 15640 | Cranford township | 22,578 | 22,578 | 22,589 | 22,655 | 22,718 | 22,686 | 22,570 | 22,478 | |
| 039 | 21000 | Elizabeth city | 120,568 | 120,568 | 120,862 | 122,149 | 123,077 | 123,611 | 124,466 | 125,809 | |
| 039 | 22860 | Fanwood borough | 7,174 | 7,174 | 7,181 | 7,218 | 7,258 | 7,262 | 7,239 | 7,228 | |
| 039 | 25800 | Garwood borough | 4,153 | 4,153 | 4,155 | 4,166 | 4,173 | 4,172 | 4,158 | 4,145 | |
| 039 | 31980 | Hillside township | 21,747 | 21,747 | 21,758 | 21,821 | 21,913 | 21,913 | 21,844 | 21,743 | |
| 039 | 36690 | Kenilworth borough | 7,675 | 7,675 | 7,682 | 7,715 | 7,741 | 7,739 | 7,747 | 7,743 | |
| 039 | 40350 | Linden city | 39,394 | 39,394 | 39,457 | 39,744 | 39,889 | 39,941 | 39,920 | 40,014 | |
| 039 | 48510 | Mountainside borough | 6,602 | 6,602 | 6,608 | 6,635 | 6,665 | 6,664 | 6,646 | 6,635 | |
| 039 | 51810 | New Providence borough | 11,907 | 11,907 | 11,918 | 11,972 | 12,007 | 11,997 | 11,956 | 11,905 | |
| 039 | 59190 | Plainfield city | 47,829 | 47,829 | 47,862 | 48,035 | 48,157 | 48,128 | 47,887 | 47,642 | |
| 039 | 61530 | Rahway city | 26,500 | 26,500 | 26,534 | 26,692 | 26,840 | 26,831 | 27,520 | 27,563 | |
| 039 | 64620 | Roselle borough | 21,274 | 21,274 | 21,302 | 21,435 | 21,487 | 21,470 | 21,369 | 21,265 | |
| 039 | 64650 | Roselle Park borough | 13,281 | 13,281 | 13,288 | 13,327 | 13,356 | 13,340 | 13,268 | 13,189 | |
| 039 | 66060 | Scotch Plains township | 22,732 | 22,732 | 22,759 | 22,890 | 23,003 | 23,008 | 22,979 | 23,212 | |
| 039 | 70020 | Springfield township | 14,429 | 14,429 | 14,444 | 14,517 | 14,718 | 14,794 | 14,757 | 14,738 | |
| 039 | 71430 | Summit city | 21,131 | 21,131 | 21,145 | 21,219 | 21,287 | 21,314 | 21,222 | 21,200 | |
| 039 | 74480 | Union township | 54,405 | 54,405 | 54,550 | 55,192 | 55,374 | 55,708 | 55,521 | 55,326 | |
| 039 | 79040 | Westfield town | 29,644 | 29,644 | 29,674 | 29,822 | 29,959 | 30,022 | 29,999 | 29,918 | |
| 039 | 81650 | Winfield township | 1,514 | 1,514 | 1,515 | 1,518 | 1,520 | 1,517 | 1,508 | 1,498 | |