I would expect there to be more, but this is a list of what I was able to find as of today.
Arizona
Gay & Lesbian Parent Support Network
P O Box 66823
Phoenix, AZ 85082-6823
602 256 9173
Arkansas
Families United Against Hate
P O Box 3272
Fayetteville, AR 72702
http://www.fuah.org
California
CaSSM: Californians for Same-Sex Marriage
P O Box 46336
Los Angeles, CA 90046
http://www.samesexmarriage.org/
Family Diversity Project Spectrum Institute
P O Box 65756
Los Angeles CA 90065
213 258 8955 ext, 707
213 258 8099
Gay & Lesbian Parents
P O Box 1332
EL TORO CA 92630
714 720 9460
Gay & Lesbian Parents of Los Angeles
7985 Santa Monica, Suite 109-346
WEST HOLLYWOOD CA 90046
213 654 0307
Gay Fathers
P O Box 51
CARMICHAEL CA 95609-0051
916 924 3237
Gay Fathers of Long Beach The Center
2017 E Fourth Street
Long Beach CA 90814
Our Family Coalition
The SF Bay Area Gay & Lesbian Family Group
870 Market Street, Suite 872
San Francisco, CA 94102
415 981 1960
http://www.ourfamily.org
Rainbow Flag Health Services
http://www-leland.stanford.edu/~blandon/rainbow.html
L.A. Gay & Lesbian Center
1625 N. Schrader Boulevard, 4th Floor
Los Angeles, CA 90028-9998
213 993 7607
Colorado
Gay & Lesbian Parents
P O Drawer E
Denver CO 80218
303 937 3625
District of Columbia
Gay & Lesbian Parenting Coalition of Metropolitan Washington
14908 Piney Grove Ct
NORTH POTOMAC MD 20878
301 762 4828
Gay Fathers Coalition of Washington, DC
P O Box 19891
Washington DC 20036-0891
301 871 4780 (Hotline)
http://members.aol.com/MDLambda/gfcdc/index.htm
Hawaii
Marriage Project
P O Box 11690
Honolulu, HI 96828
808 261 4568
808 262 9509 (fax)
http://members.tripod.com/~MPHAWAII/
Indiana
Gay & Lesbian Parents
P O Box 831
Indianapolis, IN 46206
317 926 9741
Maryland
Gay Fathers Coalition of Baltimore
241 West Chase Street
Baltimore, MD 21201
410 583 0438
http://members.aol.com/MDLambda/gfcbalt/index.htm
Massachusetts
Family Diversity Projects Inc.
P O Box 1209
Amherst, MA 01004-1209
413 256 0502
http://www.familydiv.org/
Freedom To Marry Coalition of Massachusetts
325 Huntington Avenue, Suite 88
Boston, MA 02115-4401
http://www.ftmmass.org/
Gay Fathers of Greater Boston
P O Box 1373
Boston, MA 2205
617 742 7897
http://www.gayfathersboston.org/
Lesbian/Gay Family & Parenting Services
Fenway Community Health Center
7 Haviland Street
Boston, MA 2115
617 267 0900
Michigan
Gay & Lesbian Parents Association
P O Box 2694
Southfield, MI 48037-2694
313 891 7292
313 790 2440
Minnesota
Gay and Bisexual Fathers Group
2442 Grand Ave So #1
Minneapolis, MN 55405-3435
612 874 6368
http://home.earthlink.net/~atolson/
Rainbow Families
310 East 38th Street, Suite 204
Minneapolis, MN, 55409
612 370 6651
rainbows@visi.com
Nevada
Gay Youth Outreach
University of Nevada
Mailstop 058
Reno, NV 89170
702 784 1944
New Hampshire
Rainbow Families, NH
c/o 4 Cross Street
Dover, NH 03820
603 740 4908
http://www.geocities.com/newhampshirerainbowfamilies/
New Hampshire Gay Parents
P O Box 5981
Manchester, NH 3108
603 527 1082
New York
Freedom to Marry Coalition
120 Wall Street, Suite 1500
New York, NY 10005
212 809 8585
212 809 0055 (fax)
http://www.ftm.org/
Gay Fathers
P O Box 2553
Church Street Station
New York, NY 10008-7727
Gay Fathers
P O Box 2483
PATCHOGUE NY 11772-0879
Gay Fathers Coalition
Westside Station
P O Box 404
BUFFALO NY 14213
716 633 2692
Gay & Bi Fathers’ Forum of New York
208 West 13th Street
New York, NY 10011
516 815 9120
http://www.GayBiDads.org
Gay Fathers Group
P O Box 25525
ROCHESTER NY 14625
Marriage Equality
New York, NY
http://www.marriageequality.com/
Ohio
Gay & Lesbian Parenting Group Of Central Ohio
PO Box 10814
Columbus, OH 43201
614-265-7503
http://www.geocities.com/glpgco
Momazons (Lesbian parents)
Box 02069
Columbus, OH 43202
614 267 0193
New Roots
760 E Broad Street
Columbus, OH 43205
614 267 3638
Pennsylvania
North Coast Rainbow Families
Erie, PA
814 868 0069
CALM: Custody Action for Lesbian Mothers
Box 281
Narberth, PA 19072
215 667 7508
Western Pa Freedom to Marry Coalition
P O Box 81253
Pittsburgh, PA 15217-4253
http://www.cs.cmu.edu/afs/cs/usr/scotts/ftp/wpaf2mc/
Texas
Austin Rainbow Parents
http://www.geocities.com/AustinRainbowParents
Gay, Bisexual & Questioning Fathers of Austin
1915 Wells Branch Pkwy # 302
Austin, TX 78728
http://www.ecchurch.org
Gay Fathers/Fathers First of Houston
P O Box 981053
Houston TX 77098-1053
713 782 5414
Houston Gay & Lesbian Parents
9955 S Post Oak Road
PMB #263
Houston, TX 77096
713 284 4939
http://www.hglp.org
SAGL Parents
P O Box 15094
San Antonio, TX 78212
512 828 4092
Vermont
Vermont Freedom to Marry
P O Box 1312
Middlebury, VT 05753
802 388 2633
http://www.vtfreetomarry.org/
Washington
Legal Marriage Alliance
1122 E. Pike, PAB 1190
Seattle, WA 98122-3934
206 464 3009
http://www.lmaw.org/default.htm
Wisconsin
Gay & Lesbian Parents Coalition
P O Box 93503
Milwaukee, WI 53203
Here is some link luv for today.
30 Something and Searching