TORONTO -- Dozens of vaccination clinics will be operating in Toronto today, including several pop-up sites where residents can get a shot without an appointment.

Most clinics are open to those 12 years and older who live and work in select postal codes and many are offering second doses.

Here is a list of pop-up clinics operating today:

Don Bosco Catholic Secondary School (2 St Andrew's Boulevard):

First doses to individuals 12 years and older who live/work/attend school in any “M” postal code and second doses to individuals 12 years and older going to school, living or working in Delta hot spot postal codes.

Agincourt Collegiate Institute (2621 Midland Ave.):

Open from noon to 8 p.m.

For those 12 years of age and older who live, work, or go to school in the following Scarborough priority hot spot postal codes: M1B, M1G, M1J, M1S — AND who: received their first dose of Pfizer at least 21 days ago, or received first dose of Astrazeneca at least 12 weeks ago and would like to receive Pfizer as their second dose.

Sir Oliver Mowat Collegiate Institute (5400 Lawrence Avenue East):

Open from 4 to 8 p.m.

First dose only (Pfizer) for 12+ who live, go to school, or work in Scarborough.

Downsview Arena (1633 Wilson Avenue):

Open from 10 a.m. to 6 p.m.

First doses for anyone 12 years and older in any “M” postal codes. Second doses for anyone 12 years and older who lives, works or attends school in one of these hot spots: M3J, M3K, M3L, M3M, M3N, M6M, M6N, M9L, M9M, M9N, M9V and M9W AND who received Pfizer May 24 or earlier and wants Pfizer today, received Moderna May 17 or earlier and wants Pfizer today or received AstraZeneca April 19 or earlier and wants Pfizer today.

George Harvey Collegiate (1700 Keele St.):

Open from 11 a.m. to 9 p.m.

For anyone 12 years and older. First dose for any postal code. Second dose for anyone going to school, living or working in M6M, M6N, M9N, M1S, M1B, M1G, M1J, M3K, M3M, M3J, M3N, M3L, M4A, M4H, M9L, M9M, M9W and M9V. If your 1st dose was Pfizer, the 2nd dose must be 21+ days after the 1st dose. If your 1st dose was Moderna, the 2nd dose must be 28+ days after the 1st dose. If your 1st dose was AstraZeneca, 2nd dose must be 8+ weeks after the 1st dose.

CW Jefferys Collegiate Institute (340 Senteniel Road):

Open from noon to 8 p.m. or until supplies last.

For anyone 12 years and older. First dose for any postal code. Second dose if you live, work or go to school in M9L, M9M, M9N, M9V, M9W, M6M, M6N, M4A, M4H, M3J, M3K, M3L, M3M, M3N, M1B, M1G, M1J, M1S AND you received your 1st Pfizer dose 21+ days after the 1st dose, your 1st Moderna dose 28+ days after the 1st dose and your 1st AstraZeneca dose at lease 8 weeks ago.