The council voted 20-8 in favor of the measure.

The proposal had bipartisan support coming out of committee, but some members voted against it based on the city's budget problems.

Lawmakers estimate extending benefits to domestic partners will cost the city $200,000 to $1 million a year.

City-County Councilman Zach Adamson, a co-sponsor of the proposal, said $200,000 is less than one-half percent of what the county spends on health insurance.

Nearby cities, including Columbus, Cleveland and Chicago, already have similar ordinances.

A spokesman for Mayor Greg Ballard said the mayor is reviewing the proposal and will make a decision on whether to approve or veto it after he returns from an economic development mission to Asia late next week.