Oceania - Australia, New Zealand, islands
Ohio - local singles sites for the state
Oklahoma City - local singles sites for the city
Oklahoma - local singles site for the state
Oakland - local singles sites for the city
Omaha - local singles sites for the city
Online ome of the Online Singles Browser
Online - general online singles services
Oregon - local singles sites for the state
Orlando - local singles sites for the city
Ottawa - local sites for the city in Canada
Over 40 - online dating for singles over 40
Over 50 - online dating for singles over 50
Oxford - sites for the city in the UK

OakTownSingles.com (oaktownsingles.com) - online service (Oakland)
Ohio Dates (ohiodates.com) - online service (Ohio)
OmahaSingles.com (omahasingles.com) - online service (Omaha)
Original Dating (originaldating.com) - speed dating (London)
Orlando Dates (orlandodates.com) - online service (Orlando)
Orhtodate.com (orthodate.com) - online service (Jewish)
Our 1st Date.com (our1stdate.com) - online service (General)
Other Singles Parents (othersingleparents.com) - online (Single Parents)
Outdoor Singles Network (kcd.com/ci/osn/) - online & hard-copy (Outdoors)
Over 50 Romance (over50sromance.com) - online (Singles Over 50)
Over Coffee Introductions (overcoffee.co.nz) - service (London)
Oxbridge Student (oxbridgestudent.co.uk) - online service (College)

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