Here is a list of the active roster and non-roster invitees in spring training, and their uniform numbers. Players in bold are on the active roster.
1 -- Luis Castillo
3 -- Cory Sullivan
4 -- Robinson Cancel
5 -- David Wright
6 -- Nick Evans
7 -- Jose Reyes
9 -- Marlon Anderson
10 -- Andy Green
11 -- Ramon Castro
12 -- Alex Cora
13 -- Billy Wagner
15 -- Carlos Beltran
16 -- Angel Pagan
17 -- Fernando Tatis
18 -- Jeremy Reed
19 -- Ryan Church
21 -- Carlos Delgado
22 -- J.J. Putz
23 -- Brian Schneider
25 -- Pedro Feliciano
26 -- Rob Mackowiak
27 -- Nelson Figueroa
28 -- Daniel Murphy
29 -- Connor Robertson
30 -- Rocky Cherry
32 -- Carlos Muniz
33 -- John Maine
34 -- Mike Pelfrey
35 -- Brandon Knight
36 -- Darren O'Day
38 -- Tom Martin
39 -- Bobby Parnell
40 -- Eddie Kunz
43 -- Brian Stokes
44 -- Tim Redding
46 -- Oliver Perez
47 -- Casey Fossum
48 -- Sean Green
49 -- Jonathon Niese
50 -- Duaner Sanchez
56 -- Freddy Garcia
57 -- Johan Santana
63 -- Michel Abreu
65 -- Kyle Snyder
66 -- Matt DeSalvo
67 -- Fernando Martinez
68 -- Heriberto Ruelas
70 -- Jon Switzer
71 -- Tobi Stoner
72 -- Adam Bostick
73 -- Dillon Gee
75 -- Francisco Rodriguez
76 -- Omir Santos
77 -- Rene Rivera
78 -- Josh Thole
79 -- Jose Coronado
99 -- Jose Valentin
This list is from Mets.com, so if you have any others to fill in that you might have seen in a photo or video, please let me know.