There are many websites designed to help connect you to other poly people, or swinging partners if that's your preferred variant:
Matchmaking sites (a spectrum from conventional to swinging):
- OKCupid.com - large poly contingent, allows you to be "married" and "available"
- Polymatchmaker.com - much smaller community, but explicitly poly
- Ashleymadison.com - "married dating", catering to swinging, affairs, and nominally poly
- Adultfriendfinder.com - another site geared mostly for swingers and sexual play.
- Craigslist - has personals that have been poly tolerant, inconsistant quality of respondents though (portland.craigslist.org)