Size Categories of Local Sections
ACS Local Sections
Membership Counts as of 12/31/08
Very Large | Large | Medium Large | Medium | Medium Small | Small
| Very Large (3,200+ members) | ||
| LS_ID | Local Section | # of members |
| 601 | California | 3394 |
| 315 | Chemical Society of Washington | 3994 |
| 501 | Chicago | 4642 |
| 108 | New York | 3910 |
| 303 | North Jersey | 6098 |
| 109 | Northeastern | 6940 |
| 304 | Philadelphia | 5575 |
| 628 | Santa Clara Valley | 3398 |
| Large Local Sections (1,600 - 3,199 members) | ||
| LS_ID | Local Section | # of members |
| 558 | Colorado | 2,194 |
| 102 | Connecticut Valley | 2,090 |
| 300 | Delaware | 1,875 |
| 414 | Georgia | 1,809 |
| 436 | Greater Houston | 2,577 |
| 301 | Maryland | 1,973 |
| 513 | Minnesota | 2,210 |
| 426 | North Carolina | 2,488 |
| 215 | Pittsburgh | 1,740 |
| 621 | Puget Sound | 1,864 |
| 626 | San Diego | 2,900 |
| 633 | Southern California | 2,535 |
| 523 | St. Louis | 1,741 |
| Medium Large Local Sections (800 -1,599 members) | ||
| LS_ID | Local Section | # of members |
| 557 | Central New Mexico | 810 |
| 202 | Cincinnati | 1,524 |
| 203 | Cleveland | 1,020 |
| 204 | Columbus | 1,290 |
| 452 | Dallas-Fort Worth | 1,274 |
| 207 | Detroit | 1,297 |
| 104 | Eastern New York | 1,078 |
| 413 | Florida | 883 |
| 233 | Indiana | 1,395 |
| 120 | Lehigh Valley | 873 |
| 512 | Milwaukee | 845 |
| 107 | New Haven | 935 |
| 616 | Orange County | 1,238 |
| 118 | Rochester | 834 |
| 623 | Sacramento | 802 |
| 409 | South Florida | 1,085 |
| 307 | Trenton | 815 |
| 246 | Virginia | 1,368 |
| 442 | Western Carolinas | 817 |
| 113 | Western Connecticut | 815 |
| 536 | Wisconsin | 893 |
| Medium Local Sections (400 - 799 members) | ||
| LS_ID | Local Section | # of members |
| 200 | Akron | 755 |
| 403 | Baton Rouge | 536 |
| 644 | California Los Padres | 532 |
| 405 | Carolina-Piedmont | 667 |
| 602 | Central Arizona | 759 |
| 101 | Central Massachusetts | 656 |
| 407 | Central North Carolina | 662 |
| 122 | Central Pennsylvania | 600 |
| 446 | Central Texas | 768 |
| 206 | Dayton | 434 |
| 556 | East Central Illinois | 587 |
| 218 | East Tennessee | 587 |
| 220 | Huron Valley | 758 |
| 505 | Iowa | 408 |
| 230 | Kalamazoo | 506 |
| 508 | Kansas City | 698 |
| 419 | Louisiana | 491 |
| 231 | Michigan State University | 406 |
| 211 | Midland | 701 |
| 422 | Mississippi | 449 |
| 236 | Nashville | 610 |
| 545 | Oklahoma | 444 |
| 617 | Oregon | 450 |
| 411 | Orlando | 485 |
| 620 | Portland | 679 |
| 305 | Princeton | 745 |
| 239 | Purdue | 534 |
| 111 | Rhode Island | 529 |
| 622 | Richland | 474 |
| 624 | Salt Lake | 680 |
| 447 | San Antonio | 415 |
| 627 | San Gorgonio | 722 |
| 435 | South Carolina | 722 |
| 308 | Southeastern Pennsylvania | 608 |
| 632 | Southern Arizona | 551 |
| 112 | Syracuse | 440 |
| 406 | Tampa Bay | 702 |
| 205 | Virginia Blue Ridge | 499 |
| 119 | Western New York | 792 |
| Medium Small Local Sections (200 - 399 members) | ||
| LS_ID | Local Section | # of members |
| 400 | Alabama | 397 |
| 500 | Ames | 377 |
| 402 | Auburn | 220 |
| 404 | Brazosport | 281 |
| 541 | Central Arkansas | 249 |
| 641 | Central Utah | 201 |
| 103 | Cornell | 293 |
| 116 | Corning | 235 |
| 412 | Eastern North Carolina | 261 |
| 114 | Green Mountain | 250 |
| 245 | Hampton Roads | 254 |
| 608 | Hawaii | 249 |
| 518 | Illinois Heartland | 241 |
| 417 | Jacksonville | 244 |
| 506 | Joliet | 261 |
| 228 | Lexington | 321 |
| 229 | Louisville | 369 |
| 105 | Maine | 324 |
| 235 | Memphis | 349 |
| 106 | Mid-Hudson | 377 |
| 302 | Monmouth County | 314 |
| 612 | Montana | 257 |
| 514 | Nebraska | 257 |
| 425 | North Alabama | 203 |
| 427 | Northeast Georgia | 350 |
| 237 | Northeast Tennessee | 375 |
| 515 | Northeast Wisconsin | 241 |
| 212 | Northeastern Ohio | 214 |
| 225 | Northern West Virginia | 219 |
| 517 | Omaha | 204 |
| 445 | Puerto Rico | 373 |
| 521 | Red River Valley | 218 |
| 434 | Savannah River | 280 |
| 306 | South Jersey | 337 |
| 241 | Southern Indiana | 210 |
| 600 | Southern Nevada | 235 |
| 240 | St. Joseph Valley | 392 |
| 121 | Susquehanna Valley | 232 |
| 450 | Texas A&M | 385 |
| 219 | Toledo | 358 |
| 531 | University of Missouri | 245 |
| 530 | Wakarusa Valley | 272 |
| 637 | Washington-Idaho Border | 200 |
| 232 | Western Michigan | 348 |
| Small Local Section (50-199 members) | ||
| LS_ID | Local Section | # of members |
| 643 | Alaska | 122 |
| 100 | Binghamton | 153 |
| 227 | Central Ohio Valley | 125 |
| 539 | Central Wisconsin | 113 |
| 217 | Chattanooga | 194 |
| 410 | Coastal Georgia | 197 |
| 540 | Decatur-Springfield | 184 |
| 451 | East Texas | 131 |
| 208 | Erie | 100 |
| 453 | Heart O' Texas | 104 |
| 609 | Idaho | 144 |
| 502 | Illinois-Iowa | 150 |
| 209 | Indiana-Kentucky Border | 167 |
| 610 | Inland Northwest | 104 |
| 224 | Kanawha Valley | 130 |
| 509 | Kansas State University | 119 |
| 234 | Kentucky Lake | 110 |
| 537 | LaCrosse-Winona | 91 |
| 510 | Lake Superior | 108 |
| 520 | Mark Twain | 93 |
| 454 | Middle Georgia | 99 |
| 423 | Mobile | 143 |
| 611 | Mojave Desert | 143 |
| 526 | Mo-Kan-Ok, The Tri-State | 75 |
| 543 | North Central Oklahoma | 48 |
| 544 | Northeast Oklahoma | 161 |
| 238 | Northeastern Indiana | 106 |
| 110 | Northern New York | 168 |
| 210 | Northwest Central Ohio | 93 |
| 401 | Northwest Louisiana | 77 |
| 115 | Norwich | 48 |
| 314 | Ocean County | 135 |
| 420 | Ole Miss | 125 |
| 430 | Ouachita Valley | 91 |
| 548 | Ozark | 120 |
| 549 | Panhandle Plains | 70 |
| 213 | Penn-Ohio Border | 132 |
| 244 | Penn-York | 66 |
| 431 | Pensacola | 140 |
| 550 | Permian Basin | 73 |
| 559 | Rio Grande Valley | 184 |
| 547 | Rock River | 163 |
| 433 | Sabine-Neches | 90 |
| 607 | San Joaquin Valley | 105 |
| 629 | Sierra Nevada | 198 |
| 524 | Sioux Valley | 144 |
| 645 | Snake River | 104 |
| 525 | South Central Missouri | 124 |
| 551 | South Plains | 120 |
| 448 | South Texas | 142 |
| 527 | Southern Illinois | 108 |
| 416 | Southwest Georgia | 81 |
| 437 | Southwest Louisiana | 108 |
| 546 | Tulsa | 185 |
| 538 | University of Arkansas | 142 |
| 221 | Upper Ohio Valley | 170 |
| 532 | Upper Peninsula | 76 |
| 243 | Wabash Valley | 95 |
| 226 | Western Maryland | 101 |
| 535 | Wichita | 194 |
| 553 | Wichita Falls-Duncan | 77 |
| 444 | Wilson Dam | 50 |
| 223 | Wooster | 107 |
| 639 | Wyoming | 177 |