Contact information for UMC's global offices is listed below.
Specific questions about UMC foundry services can be submitted through the AskUMC web page

Headquarters:

UMC

No. 3, Li-Hsin 2nd Road,
Hsinchu Science Park,
Hsinchu, Taiwan, R.O.C.
Tel: 886-3-578-2258
Fax: 886-3-577-9392
Email: foundry@umc.com

Europe:

UMC Europe BV

De entree 77,
1101 BH Amsterdam Zuidoost,
The Netherlands
Tel: 31-(0)20-5640950
Fax: 31-(0)20-6977826

China:

HeJian Technology (Suzhou)

No. 333, Xinghua Street,
Suzhou Industrial Park, Suzhou,
Jiangsu Province 215025, China
Tel: 86-512-65931299
Fax: 86-512-62530172
email: ashj@hjtc.com.cn

North America:

UMC USA

488 De Guigne Drive,
Sunnyvale, CA 94085, USA
Tel: 1-408-523-7800
Fax: 1-408-733-8090
Email: sales@umc-usa.com
Directions: Map (pdf)

Japan:

UMC Group Japan

15F Akihabara Centerplace Bldg.,
1 Kanda Aioi-Cho, Chiyoda-Ku,
Tokyo 101-0029, Japan
Tel: +81-3-5294-2701
Fax: +81-3-5294-2707

Singapore:

UMC-SG

No. 3, Pasir Ris Drive 12,
Singapore 519528
Tel: +65-6213-0018
Fax: +65-6213-0005

Korea:

UMC Korea

1117, Hanshin Intervally 24,
322, Teheran-ro, Gangnam-gu,
Seoul, Korea
Tel: +82-2-2183-1790
Fax: +82-2-2183-1794
Email: korea@umc.com