You're in luck. I got this list from the MTA about 6 months ago.
NEW YORK CITY TRANSIT PUBLIC REST ROOMS
BOOTH LINE STATION M W
A2* N/R/W Lexington Avenue 1 1
A10 N/Q/R/W 57th Street 1 1
A43 J/M/N/Q/R/W/2/6 Canal Street 1** 1**
A60 R/W Whitehall Street 1 1
A81* A/C/J/M/Z/2/3/4/5 Fulton Street 1 1
B12 B/Q/S Prospect Park 1 1
B16 B/Q Church Avenue 1 1
B19 B/Q Newkirk Avenue 1 0
B24 B/Q Kings Highway 1 1
B27 B/Q Sheepshead Bay 1 1
B29 B/Q Brighton Beach 1 1
C8 B/M/Q/R Dekalb Avenue 1** 1*
C9 D/M/N/R Pacific Street 1 1
C18 D/M/N/R 36th Street 1 1
C21 N/R 59th Street 1 1
C27 R 95th Street 1 1
D5 N New Utrecht Avenue 1 1
G1 D/F/Q Stillwell Avenue 1 1
H27 L/M Myrtle Avenue 1** 0
H41 L Rockaway Parkway 1 1
J9 J/M/Z Myrtle Avenue 1 1
BOOTH LINE STATION M W
N002A A 207th Street 1 1
N13 A/C 168th Street 1 0
N26 A/B/C/D 125th Street 1** 1**
N49 A/B/C/D/1/9 59th Street 1** 1**
N63* A/C/E 42nd Street 1 1
N71 A/C/E 34th Street 1 1
N78 A/C/E 14th Street 1 1
N83 A/B/C/D/E/F/V West 4th Street 1** 1**
N92 A/C Chambers Street 1 1
N95 A/C/J/M/Z/2/3/4/5 Bdwy. Junction 1** 1**
N103 A/C/F Jay Street 1 1
N124 A/C/J/L/Z Bdwy-East New York 1** 1**
N128 A/C Euclid Avenue 1** 1**
N182A A Howard Beach 1 1
N187 A Rockaway Park 1 1
N196 A Far Rockaway 1 1
N203 B/D/4 161st Street 1 1
N217 B/D Fordham Road 1 1
N224 D 205th Street 1 1
N303 E/V 5th Avenue 1 1
N309A E/G/R/V Queens Plaza 1** 1**
N324 E/F/G/R/V/7 Roosevelt Avenue 1** 1**
N333* E/F/G/R/V 71st Avenue 1 1
N335* E/F Union Tpk-Kew Gdn 1 0
N343 F 179th Street 1** 1**
N503 B/D/F/V 42nd Street 1 1
N506 B/D/F/N/Q/R/V/W 34th Street 1 1
N546 F Church Avenue 1 0
N549 F 18th Avenue 1 1
N557 F Kings Highway 1 0
N600 F 57th Street 1 1
N606 E/J/Z Parsons-Archer 1 1
BOOTH LINE STATION M W
R116 1/2/3/9 Chambers Street 1 1
R127 1/2/3/9 14th Street 1 1
R141 1/2/3/9 34th Street 1 1
R210 4/5/6 Brooklyn Bridge 1 1
R221 4/5/6/L/N/Q/R/W Union Square 1 1
R238 4/5/6/7/S Grand Central 1** 1**
R249 4/5/6 86th Street 1** 0
R250 4/5/6 86th Street 0 1**
R258 4/5/6 125th Street 1** 1**
R294 4 Woodlawn Road 1** 1**
R325 2/5 East 180th Street 1 1
R336 2 241st Street 1** 1**
R412 6 Hunts Point 1 1
R417 6 Pkchester-E. 177th St. 1 1
R423 6 Pelham Bay Park 1** 1**
R509 7/N/W Queensboro Plaza 1 1
R515 N/W Ditmars Blvd. 1 1
R523 7 Woodside-61st St. 1 1
R532 7 Willets Point 1 1
R534 7 Main Street 1 1
R601A 2/3/4/5/M/R Borough Hall 1 1
R622 2/3/4/5/S Franklin Avenue 1 0
R626 3/4 Utica Avenue 1** 0
R645 2/5 Flatbush Avenue 1 1
R730* 5 Dyre Avenue 1 1
*Part-time booth location where the facilities available are only open when the booth is open.
**Closed for construction work.
Note: All restrooms open 24 hours unless otherwise noted. However, there may be times when they are temporarily closed for cleaning or repairs.
More current information may be available by contacting our Department of Subways* Division of Service Delivery at (718) 243-3222, or by writing to the Division of Service Delivery, Complaints and Correspondence, 130 Livingston Plaza, Room 6088B, Brooklyn, NY 11201. Otherwise, more current information may be available under the Freedom of
Information Law (FOIL) by writing to:
Denise Fraser
MTA NYCT-F.O.I.L.
130 Livingston Street, #1214
Brooklyn, NY 11201