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Two of the most conservative House districts in the nation are in Utah and the state's other two are not far behind, according to a new report by some of the nation's most prominent political handicappers.

Rep. Jason Chaffetz represents the seventh most conservative area and Rep. Rob Bishop's district is eighth, according to the Cook Political Report's partisan voting index. And no Democrat represents a more Republican area than Rep. Jim Matheson, D-Utah, which has been true for a few years now — even though Matheson has switched districts.

Cook creates the index by comparing how each district votes in the presidential race compared to the nation at large. For example, Matheson's 4th Congressional District voted 16 percent more Republican than the United States did, so it is an R+16 district. That's the 53rd most conservative in the nation and is two points higher than it was when he represented the old 2nd Congressional District before November's election.

The most Republican House seat — an R+32 — is held by Mac Thornberry in Texas. Chaffetz's district is R+28 and Bishop's is R+27.

To put that in perspective, Republicans now control 232 House seats and 224 of them are less conservative than the seats in Utah held by Bishop and Chaffetz.

So where does that leave Rep. Chris Stewart's 2nd District, which includes Salt Lake City and then hugs the western side of the state down to St. George?

Stewart's district is an R+18, ranking it the 39th most conservative.

mcanham@sltrib.comTwitter: @mattcanham —

Country's most partisan House districts

Most Democratic

1 • Rep. Jose Serrano, D-N.Y., 15th District (D+43)

2 • Rep. Charlie Rangel, D-N.Y., 13th District (D+42)

3 • Rep. Chaka Fattah, D-Penn., 2nd District (D+38)

4 • Rep. Barbara Lee, D-Calif., 13th District (D+37)

5 • Rep. Danny Davis, D-Ill., 7th District (D+36)

Most Republican

1 • Rep. Mac Thornberry, R-Texas, 13th District (R+32)

2 • Rep. Mike Conaway, R-Texas, 11th District (R+31)

3 • Rep. Doug Collins, R-Ga., 9th District (R+30)

4 • Rep. Kevin Brady, R-Texas, 8th District (R+29)

5 • Rep. Spencer Bachus, R-Ala., 6th District (R+28)

Source: Cook Political Report