The Manitou elven tribe rejected the authority of Saskatoon government in 2062 after military troops supported by ACS units raided a suspected eco-terrorist hideout and "accidentally" killed several tribal leaders. The secession was defeated in 2065, according to Sixth World Almanac. Considering the largest cities in Manitou territory were Churchill and Lynn Lake (both are under 1,000 nowadays), the government and Aztechnology troops might be more numerous than actual elves.
From a demographic and political point of view, the Sinsearach tribe in Salish-Shidhe is a far more proeminent elven community. The Salish-Shidhe Council leaves a lot of power to tribal authorities. However, since the Sinsearach are the elves who did not join Tir Tairngire, they're probably a lot less into the elven culture, especially since the most adamant about it would simply cross the border to move into the "Land of Promises."
Though Wales has a significant elven population (22%), Snowdonia never was described as a specifically elven region. The duchess of Snowdonia happens to be an elf, and her personal guard mixes humans and elves, but that's about it.
There is the Gwynedd enclave, also in Wales, where elven eco-communities settled and co-exist with local population without mingling too much (but it would be difficult to say if it's because the elves want to be on their own or if they simply cannot speak Welsh). The elf did have a licensed militia patrolling their lands, but the key word here is "licensed".
