Size Categories of Local Sections

ACS Local Sections

Membership Counts as of 12/31/10

Very Large (3,200+ members)
 LS_ID Local Section# of members
601California3,750
315Chemical Society of Washington4,185
501Chicago4,634
108New York4,162
303North Jersey5,576
109Northeastern7,290
304Philadelphia5,258
628Santa Clara Valley3,352
Large Local Sections (1,600 - 3,199 members)
 LS_ID Local Section# of members
558Colorado2,392
102Connecticut Valley2,086
300Delaware1,713
414Georgia1,983
436Greater Houston2,724
301Maryland2,148
513Minnesota2,272
426North Carolina2,423
215Pittsburgh1,874
621Puget Sound1,999
626San Diego2,825
633Southern California2,613
523St. Louis1,707
Medium Large Local Sections (800 -1,599 members)
 LS_ID Local Section# of members
557Central New Mexico825
446Central Texas858
202Cincinnati1,493
203Cleveland1,024
204Columbus1,227
452Dallas-Fort Worth1,537
207Detroit1,267
104Eastern New York1,090
413Florida931
233Indiana1,442
120Lehigh Valley947
512Milwaukee875
236Nashville805
107New Haven924
616Orange County1,286
445Puerto Rico1,238
118Rochester827
623Sacramento932
624Salt Lake834
409South Florida1,210
246Virginia1,451
442Western Carolinas827
536Wisconsin862
Medium Local Sections (400 - 799 members)
 LS_ID Local Section# of members
200Akron788
400Alabama502
500Ames401
403Baton Rouge482
644California Los Padres653
405Carolina-Piedmont695
602Central Arizona759
541Central Arkansas413
101Central Massachusetts664
407Central North Carolina706
122Central Pennsylvania598
206Dayton478
556East Central Illinois539
218East Tennessee625
220Huron Valley700
505Iowa429
230Kalamazoo469
508Kansas City719
419Louisiana625
211Midland710
422Mississippi554
545Oklahoma490
617Oregon465
411Orlando550
620Portland749
305Princeton669
239Purdue518
111Rhode Island568
622Richland546
447San Antonio484
627San Gorgonio771
435South Carolina733
308Southeastern Pennsylvania697
632Southern Arizona574
240St. Joseph Valley424
112Syracuse491
406Tampa Bay716
450Texas A&M439
307Trenton783
205Virginia Blue Ridge587
113Western Connecticut756
119Western New York782
Medium Small Local Sections (200 - 399 members)
 LS_ID Local Section# of members
402Auburn270
404Brazosport255
641Central Utah233
217Chattanooga219
410Coastal Georgia225
103Cornell297
116Corning253
540Decatur-Springfield200
451East Texas211
412Eastern North Carolina267
114Green Mountain263
245Hampton Roads288
608Hawaii250
518Illinois Heartland253
417Jacksonville233
506Joliet281
228Lexington365
229Louisville394
105Maine373
235Memphis380
231Michigan State University395
106Mid-Hudson394
302Monmouth County327
612Montana278
514Nebraska301
425North Alabama222
427Northeast Georgia369
237Northeast Tennessee353
515Northeast Wisconsin264
225Northern West Virginia247
521Red River Valley237
559Rio Grande Valley224
434Savannah River293
524Sioux Valley220
306South Jersey331
448South Texas216
241Southern Indiana243
600Southern Nevada253
121Susquehanna Valley288
219Toledo356
546Tulsa218
531University of Missouri239
530Wakarusa Valley 300
637Washington-Idaho Border234
232Western Michigan384
535Wichita219
Small Local Section (50-199 members)
 LS_ID Local Section# of members
643Alaska128
100Binghamton191
227Central Ohio Valley140
539Central Wisconsin140
208Erie160
453Heart O' Texas152
609Idaho164
502Illinois-Iowa190
209Indiana-Kentucky Border157
610Inland Northwest118
224Kanawha Valley176
509Kansas State University118
234Kentucky Lake194
537LaCrosse-Winona111
510Lake Superior128
520Mark Twain115
454Middle Georgia138
423Mobile152
611Mojave Desert158
526Mo-Kan-Ok, The Tri-State103
238Northeastern Indiana111
544Northern Oklahoma191
212Northeastern Ohio192
110Northern New York174
210Northwest Central Ohio125
401Northwest Louisiana102
314Ocean County174
420Ole Miss195
517Omaha195
430Ouachita Valley96
548Ozark157
549Panhandle Plains66
213Penn-Ohio Border173
244Penn-York76
431Pensacola153
550Permian Basin106
547Rock River184
433Sabine-Neches91
607San Joaquin Valley136
629Sierra Nevada184
645Snake River130
525South Central Missouri126
551South Plains164
527Southern Illinois137
416Southwest Georgia141
437Southwest Louisiana127
538University of Arkansas150
221Upper Ohio Valley158
532Upper Peninsula87
243Wabash Valley110
226Western Maryland122
553Wichita Falls-Duncan89
444Wilson Dam55
223Wooster115
639Wyoming175