The town of Avallon in the Burgundy region asked the permission of Cox's family earlier this year before unveiling "rue Jo Cox" in a working-class area that has been redeveloped by the council.
"We needed to find a name for the street. We wanted it to be a woman and she stood for values which we share as well," deputy mayor Gerard Delorme told AFP.
Cox's name was proposed along with several others but quickly won unanimous backing on the council, which is headed by mayor Jean-Yves Caullet, a member of President Emmanuel Macron's Republic on the Move (LREM) party.
France's streets are used to honour deceased personalities and important figures, mostly men from French history but with a few notable exceptions.
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Paris hosts an Avenue Winston Churchill in tribute to the British war-time leader and there are numerous streets countrywide named after famed English scientist Isaac Newton.
Cox, a Labour politician who defended immigration and campaigned for Britain to stay in the European Union, was stabbed to death by a far-right extremist on June 16 last year ahead of Britain's referendum on EU membership.
In December last year, eurosceptic councillors in the town of Beaucaire in southern France voted to name a street after Britain's decision to leave the 28-member bloc.
Critics mocked the decision afterwards, noting that "Rue de Brexit" was a dead-end.
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