Besides the official Seoul Central Mosque in Itaewon (my post here) , the list of mosques in other provinces in Korea is below, this list doesn't include the mosques (masjid)/prayers rooms that students or other private individuals have established:
Gyeonggi-do/ Paju Masjid
Located near the Imjin River , the Paju Masjid is mostly frequented by Bangladeshi and Pakistani Muslims in the vicinity.
Address : 421-9, Yeongtae-ri, Wonreung-myeon, Paju-si, Gyeonggi-do
Tel : +82-31-946-2110
Located in the east end of Incheon, Bupyeong Masjid is a place of worship for immigrant Muslim workers in nearby areas, including Namdong Industrial Complex in Incheon.
Address : 574-19, Sipjeong-dong, Bupyeong-gu, Incheon
Tel : +82-32-512-2612
Anyang Masjid, not far from Seoul, is operated independently by Muslim immigrants from Bangladesh and Pakistan.
Address : 618-132, Anyang 5-dong, Anyang-si, Gyeonggi-do
Tel : +82-31-444-7757
An imam from Bangladesh serves at the Ansan Masjid, which is operated independently by immigrant Muslims from Bangladesh, Pakistan, and Indonesia working at the nearby Ansan Industrial Complex.
Address : 741-5, Wongok-dong, Danwon-gu, Ansan-si, Gyeonggi-do
Tel : +82-31-492-1948
In Gwangju (Gyeonggi-do), which is adjacent to Seongnam, Icheon and Namyangju, Gwangju Masjid, Korea 's third masjid, was opened in 1981.
Address : 48-9, Yeok-ri, Gwangju-eup, Gwangju-gun, Gyeonggi-do
Tel : +82- 31- 761-3424
Matching Jeonju's reputation as a city of tradition and art, Jeonju Masjid shows the harmony between Korean and Islamic architecture. Traditional Korean roof tiles adorn the Islamic dome.
Address : 1562-10, Inhu-dong 2-ga, Deokjin-gu, Jeonju-si, Jeollabuk-do
Tel : +82- 63- 243-1483
Busan Masjid was the second masjid to open in Korea. It was built in 1980 with financial support from Ali Fellaq, the former minister of finance of Libya .
Address : 30-1, Namsan-dong, Geumjeong-gu, Busan
Tel : +82- 51- 518-9991
Islamic Centers/Macheon-Geoyeo Center
Address : 186-26, Geoyeo-dong, Songpo-gu, Seoul
Tel : +82-2- 431-6850
Address : 320-15, Dangsu-dong, Gwonseon-gu, Suwon , Gyeonggi-do
Tel : +82- 31- 295-2956
Address : Rm. 1215, Jeonghan Officetel, 939, Nohyeong-dong, Jeju
Tel : +82- 64- 712-1215
Address : 202-6, Jukjeon-dong, Dalseo-gu, Daegu
Tel : +82-53- 523-2171
Address : 894-7, Wolgyeo-dong, Gwangsan-gu, Gwangju
Tel : +82-62- 972-5136
Website of Korea Muslim Foundation: http://www.koreaislam.org (Korean, English)
For Pocheon, Cheonnan, Kimhae and Jinju please look at the this blog post by an Indonesian blogger.
Visit Korea Muslim Federation website, here they have updated a list of mosques in various cities but it is in Korean language however, one can get help to locate phone number and address.
Credits: Korea Tourism Corporation