# 20th Century Plumbing and Heating, Inc.

Business profile: public business information with links to supporting state records. Data as of October 16, 2026.

- Legal business name: 20th Century Plumbing and Heating, Inc.
- Alternative and DBA names: Siskiyou Mechanical, Inc.
- Entity type: C corporation
- Original incorporation date: December 12, 1979
- Time in business: 46 years and 10 months
- Jurisdiction count: 2

## All known addresses

- 1252 W McAndrews Rd, Medford, OR 97501 (listed in Oregon, California)

## Registered states

- [California](https://index.baselayer.com/ca/e1ddf3cd62b84231): Foreign registration, as Siskiyou Mechanical, Inc.
- [Oregon](https://index.baselayer.com/or/635baf0239769f2c): Domestic registration

Source: public state registration records. Missing values are not a negative finding.

Cite as: Baselayer Business Index (https://index.baselayer.com/business/635baf0239769f2c)