American Christians are everywhere, but regional differences are stark.

According to the ASARB's 2010 US Religion Census - Religious Congregations & Membership Study, roughly half of American residents identified themselves as adhering to a specific faith. Christians made up the lions share of the faithful, at 91%, and the major denominations were heavily correlated to geography.

The two largest groups – Evangelicals & Catholics – have almost inverse geographic distributions.

% Population Identifying as Evangelical Christian
(33.2% of Christians)

% of Population Identifying as Catholic
(39.2% of Christians)

Mainline Protestants tend to keep to the Great Plains, upper Midwest, and northern Appalachia.

% of Population Identifying as Mainline Protestant
(15.0% of Christians)

Two additional denominations make up non-negligible segments of American Christianity:
Black Protestants, and members of the Church of Latter-Day Saints, or 'Mormons'.

These two denominations also keep to their respective regions: the South's Black Belt and the Moutain West surrounding Utah.

% Population Identifying as Black Protestant
(3.2% of Christians)

% of Population Identifying as LDS/Mormon
(4.1% of Christians)

Which denominations are most popular in your county?