Petaluma Number Landmark Name Location Image Notes California Historical Landmark Number National Recognition 1 Residence 119 Howard Street38°13′59″N 122°38′41″W / 38.233174°N 122.64485°W /38.233174; -122.64485 (Residence at 119 Howard Street ) Ord. No. 1490 N.C.S. 2 Farrell House/River Café Building 222 Weller Street38°14′08″N 122°38′13″W / 38.235505°N 122.63698°W /38.235505; -122.63698 (Farrell House ) Ord. No. 1673 N.C.S. 3 Green Mill Sign Hwy 101 near Holm Road38°16′10″N 122°39′58″W / 38.269480°N 122.66598°W /38.269480; -122.66598 (Green Mill Sign ) Ord. No. 1358 N.C.S. 4 Coca-Cola Sign Western Ave. & Kentucky St.38°14′02″N 122°38′28″W / 38.233766°N 122.64121°W /38.233766; -122.64121 (Coca-Cola Sign ) Ord. No. 1249 N.C.S. 5 Andresen Building 19 Western Ave.38°14′01″N 122°38′27″W / 38.233743°N 122.64081°W /38.233743; -122.64081 (Andresen Building ) Ord. No. 1314 N.C.S. 6 WCTU Drinking Fountain Western Ave. & Petaluma Ave. N38°14′02″N 122°38′25″W / 38.233947°N 122.64041°W /38.233947; -122.64041 (WCTU Drinking Fountain ) Ord. No. 1375 N.C.S. 7 Great Petaluma Mill 6-8 Petaluma Blvd.38°14′02″N 122°38′21″W / 38.233915°N 122.63918°W /38.233915; -122.63918 (Great Petaluma Mill ) Ord. No. 1297 N.C.S. 8 Old Post Office Building 10-22 Petaluma Blvd.38°14′01″N 122°38′23″W / 38.233703°N 122.63971°W /38.233703; -122.63971 (Old Post Office Building ) Ord. No. 1298 N.C.S. 9 McNear Building 15-25 Petaluma Blvd.38°14′01″N 122°38′25″W / 38.233608°N 122.64035°W /38.233608; -122.64035 (McNear Building ) Ord. No. 1299 N.C.S. 10 Koby Residence +Carriage House 901 D St.38°13′32″N 122°38′27″W / 38.225565°N 122.64073°W /38.225565; -122.64073 (Koby Residence and Carriage House ) Ord. No. 1814 N.C.S. 11 Hansen House 719 North McDowell Blvd38°15′36″N 122°38′41″W / 38.260031°N 122.64463°W /38.260031; -122.64463 (Hansen House ) Ord. No. 2471 N.C.S. 12 Residence 200 West Street38°14′29″N 122°38′48″W / 38.241283°N 122.64673°W /38.241283; -122.64673 (Residence at 200 West Street ) Ord. No. 2515 N.C.S. 13 Quinn Residence 503 2nd Street38°13′54″N 122°37′56″W / 38.231687°N 122.63222°W /38.231687; -122.63222 (Quinn Residence ) Ord. No. 2273 N.C.S. 14 Burdell Building 405 East D Street38°14′15″N 122°38′04″W / 38.237389°N 122.63441°W /38.237389; -122.63441 (Burdell Building ) Ord. No. 2381 N.C.S. [ 4] 15 Lee Residence 206 E Street38°13′57″N 122°38′08″W / 38.232447°N 122.63566°W /38.232447; -122.63566 (Lee Residence ) Ord. No. 2242 N.C.S. [ 5] 16 Petaluma Silk Mill 450 Jefferson Street38°14′10″N 122°37′51″W / 38.236107°N 122.63090°W /38.236107; -122.63090 (Petaluma Silk Mill ) Designed by noted architectBrainerd Jones .[ 6] National Register 86000386[ 7] 17 Philip Sweed House [ 8] 301 Keokuk Street38°14′10″N 122°38′46″W / 38.236242°N 122.64623°W /38.236242; -122.64623 (Philip Sweed House ) [ 9] 18 Petaluma Historic Commercial District [ 10] Petaluma Blvd.: B St. to Prospect St., approx. 23 acres38°14′07″N 122°38′27″W / 38.235238°N 122.64096°W /38.235238; -122.64096 (Petaluma Historic Commercial District ) Ord. No. 2097 N.C.S. National Register 95000354[ 11] 19 Ellis-Martin House 1197 East Washington Street38°14′43″N 122°37′49″W / 38.245140°N 122.63015°W /38.245140; -122.63015 (Ellis-Martin House ) National Register 06000915[ 12] 20 Old Petaluma Opera House /The Maclay Building147-149 Kentucky Street38°14′06″N 122°38′31″W / 38.234909°N 122.64199°W /38.234909; -122.64199 (Old Petaluma Opera House ) National Register 78000801[ 13] 21 Free Public Library of Petaluma 20 4th Street38°13′57″N 122°38′24″W / 38.232558°N 122.64002°W /38.232558; -122.64002 (Free Public Library of Petaluma ) National Register 88000925[ 14] 22 U.S. Post Office 120 4th Street38°13′54″N 122°38′16″W / 38.231767°N 122.63773°W /38.231767; -122.63773 (U.S. Post Office ) National Register 85000140[ 15] [ 16] District Oakhill-Brewster Historic District Generally north and west of downtown area.38°14′12″N 122°38′51″W / 38.236591°N 122.647429°W /38.236591; -122.647429 (Oakhill-Brewster Historic District ) Ord. No. 1796 N.C.S.[ 17] District A Street Historic District Generally south and east of downtown area.38°13′54″N 122°38′29″W / 38.231705°N 122.641483°W /38.231705; -122.641483 (A Street Historic District ) Ord. No. 1666 N.C.S.[ 18]