Members of the 110th United States Congress

Columns: Region | Democrats | Republicans | Total | States as defined in the US Census
New England | 21 | 1 | 22 | CT , MA , ME , NH , RI , VT | Mid-Atlantic | 47 | 23 | 70 | DE , MD , NJ , NY , PA | Midwest | 34 | 35 | 69 | MI , IL , IN , OH , WI | Great Plains | 16 | 15 | 31 | IA , KS , MN , MO , ND , NE , SD | South Atlantic | 29 | 41 | 71 | FL , GA , NC , SC , VA , WV | South Central | 32 | 42 | 74 | AL , AR , KY , LA , MS , OK , TN , TX | Mountain | 11 | 17 | 28 | AZ , CO , ID , MT , NM , NV , UT , WY | Pacific | 46 | 24 | 70 | AK , CA , HI , OR , WA | Total | 236 | 198 | 435

Example questions:
What is the name of the region which included the 3rd most populous state with representatives in the 110th United States Congress ? | How many representatives in the 110th United States Congress were from the region which included Iowa ? | What is the name of the region which had 28 total representatives in the 110th United States Congress ? | What is the name of the region which had 41 republicans in the 110th United States Congress ?

Answers:
South Atlantic | 31 | Mountain | South Atlantic