Five of the eleven counties that voted on secession from Colorado yesterday voted in favor of leaving the state to form their own (contrary to the 1 reported by National Public Radio this morning and the 5 reported by Colorado Public Radio, seconds later). They are: Yuma, Cheyenne, Phillips, Kit Carson, and Washington. [Ed. corrected to reflect a "No" vote in Sedgewick county previously reported as voting yes in multiple sources.]
Basically, a thin strip of thinly populated counties on the northern part of the Eastern border of Colorado plus adjacent Washington County (home to most of my Colorado relatives).
More analysis here.