| Size Category |
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| Very Large (3,200+ members) |
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| Section (Member Count 12/31/08) |
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| Chemical Society of Washington (3994) |
| Chicago (4642) |
| New York (3910) |
| North Jersey (6098) |
| Northeastern (6940) |
| Philadelphia (5575) |
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| Large (1,600 - 3,199 members) |
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| Section (Member Count 12/31/08) |
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| Delaware ( 1875) |
| Georgia (1809) |
| Greater Houston (2577) |
| Minnesota (2210) |
| Pittsburgh (1740) |
| San Diego (2900) |
| Southern California (2535) |
| St Louis (1741) |
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| Medium Large (800 - 1,599 members) |
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| Section (Member Count 12/31/08) |
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| Cincinnati (1524) |
| Detroit (1297) |
| Eastern New York (1078) |
| Indiana (1395) |
| New Haven (935) |
| Orange County (1238) |
| Rochester (834) |
| South Florida (1085) |
| Trenton (815) |
| Virginia (1368) |
| Western Carolinas (817) |
| Western Connecticut (815) |
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| Medium (400 - 799 members) |
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| Section (Member Count 12/31/08) |
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| Akron (755) |
| Baton Rouge (536) |
| Carolina-Piedmont (667) |
| Central North Carolina (662) |
| Central Pennsylvania (600) |
| Central Texas (768) |
| Dayton (434) |
| Huron Valley (758) |
| Kalamazoo (506) |
| Kansas City (698) |
| Michigan State University (406) |
| Midland (701) |
| Nashville (610) |
| Oklahoma (444) |
| Oregon (450) |
| Rhode Island (529) |
| Richland (474) |
| Southeastern Pennsylvania (608) |
| Tampa Bay (702) |
| Virginia Blue Ridge (499) |
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| Medium Small (200 - 399 members) |
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| Section (Member Count 12/31/08) |
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| Alabama (397) |
| Brazosport (281) |
| Central Arkansas (249) |
| Hawaii (249) |
| Illinois Heartland (241) |
| Jacksonville (244) |
| Maine (324) |
| Mid-Hudson (377) |
| Northeast Tennessee (375) |
| Puerto Rico (373) |
| Savannah River (280) |
| South Jersey (337) |
| Southern Nevada (235) |
| Susquehanna Valley (232) |
| University of Missouri (245) |
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| Small (50 - 199 members) |
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| Section (Member Count 12/31/08) |
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| Heart O' Texas (104) |
| Illinois-Iowa (150) |
| Kanawha Valley (130) |
| Kentucky Lake (110) |
| Mark Twain (93) |
| Mobile (143) |
| Mo-Kan-Ok, The Tri-State (75) |
| Northeast Oklahoma (161) |
| Northern New York (168) |
| Norwich (48) |
| Penn-Ohio Border (132) |
| Permian Basin (73) |
| South Central Missouri (124) |
| South Texas (142) |
| Southern Illinois (108) |
| Southwest Georgia (81) |
| Western Maryland (101) |
| Wilson Dam (50) |
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