All corners of the United States help headline a new poll from Gallup that examines changes to uninsured rates since January 2014, when PPACA's individual mandate provision took effect. Arkansas and Kentucky saw the sharpest decline in uninsured adult residents, with decreases of 10.1 and 8.5 percent respectively. Rounding out the top five states were Delaware (a -7.2 percent change), Washington state (-6.1 percent) and Colorado (-6.0 percent).

These states may span the length of a U.S. map, but they do have a few commonalities: All five chose to expand Medicaid, and four of the five set up their own state-based health insurance exchanges. (Arkansas has a state-federal partnership exchange.) Across the board, states that enacted both of these measures have seen a steeper decline in uninsured rates than states that have not: 4 percent across 21 states versus just 2.2 percent across the 29 states that either host a federal exchange or have declined to expand Medicaid.

These improved insured rates come at a cost, of course. A primary objection for states that have chosen not to expand Medicaid is the massive amount of resources a more robust program will consume. States like Utah have negotiations underway with the Centers for Medicare and Medicaid Services (CMS) to reach more flexible terms for what an expanded program might look like. If a solution is reached, it may help serve as a blueprint for other states reluctant to commit to the expense of more Medicaid enrollees, but eager to provide improved access to healthcare.

Notably, Kansas (with a federal exchange and no Medicaid expansion) was the only state to see a significant rise in the percentage of uninsured, with a growth rate of 5.1 percent. It was not the only state that saw any increase, however: Iowa, with both of these PPACA-approved measures in place, has 0.6 percent more uninsured adults now than it did at the start of the year.

Read on to see where each state stands at the mid-year point.

Note: This data, collected as part of the Gallup-Healthways Well-Being Index, are based on respondents' self-reports of health insurance status based on the question, “Do you have health insurance coverage?”

Alabama

% Uninsured, 2013: 17.7

% Uninsured, midyear 2014: 15.1

Change in uninsured (pct. pts.): -2.6

Medicaid expansion AND state/partnership exchange in 2014: No

Alaska

% Uninsured, 2013: 18.9

% Uninsured, midyear 2014: 16.2

Change in uninsured (pct. pts.): -2.7

Medicaid expansion AND state/partnership exchange in 2014: No

Arizona

% Uninsured, 2013: 20.4

% Uninsured, midyear 2014: 17.2

Change in uninsured (pct. pts.): -3.2

Medicaid expansion AND state/partnership exchange in 2014: No

Arkansas

% Uninsured, 2013: 22.5

% Uninsured, midyear 2014: 12.4

Change in uninsured (pct. pts.): -10.1

Medicaid expansion AND state/partnership exchange in 2014: Yes

California

% Uninsured, 2013: 21.6

% Uninsured, midyear 2014: 16.3

Change in uninsured (pct. pts.): -5.3

Medicaid expansion AND state/partnership exchange in 2014: Yes

Colorado

% Uninsured, 2013: 17.0

% Uninsured, midyear 2014: 11.0

Change in uninsured (pct. pts.): -6.0

Medicaid expansion AND state/partnership exchange in 2014: Yes

Connecticut

% Uninsured, 2013: 12.3

% Uninsured, midyear 2014: 7.4

Change in uninsured (pct. pts.): -4.9

Medicaid expansion AND state/partnership exchange in 2014: Yes

Delaware

% Uninsured, 2013: 10.5

% Uninsured, midyear 2014: 3.3

Change in uninsured (pct. pts.): -7.2

Medicaid expansion AND state/partnership exchange in 2014: Yes

Florida

% Uninsured, 2013: 22.1

% Uninsured, midyear 2014: 18.9

Change in uninsured (pct. pts.): -3.2

Medicaid expansion AND state/partnership exchange in 2014: No

Georgia

% Uninsured, 2013: 21.4

% Uninsured, midyear 2014: 20.2

Change in uninsured (pct. pts.): -1.2

Medicaid expansion AND state/partnership exchange in 2014: No

Hawaii

% Uninsured, 2013: 7.1

% Uninsured, midyear 2014: 6.9

Change in uninsured (pct. pts.): -0.2

Medicaid expansion AND state/partnership exchange in 2014: Yes

Idaho

% Uninsured, 2013: 19.9

% Uninsured, midyear 2014: 16.6

Change in uninsured (pct. pts.): -3.3

Medicaid expansion AND state/partnership exchange in 2014: No

Illinois

% Uninsured, 2013: 15.5

% Uninsured, midyear 2014: 12.3

Change in uninsured (pct. pts.): -3.2

Medicaid expansion AND state/partnership exchange in 2014: Yes

Indiana

% Uninsured, 2013: 15.3

% Uninsured, midyear 2014: 15.0

Change in uninsured (pct. pts.): -0.3

Medicaid expansion AND state/partnership exchange in 2014: No

Iowa

% Uninsured, 2013: 9.7

% Uninsured, midyear 2014: 10.3

Change in uninsured (pct. pts.): 0.6

Medicaid expansion AND state/partnership exchange in 2014: Yes

Kansas

% Uninsured, 2013: 12.5

% Uninsured, midyear 2014: 17.6

Change in uninsured (pct. pts.): 5.1

Medicaid expansion AND state/partnership exchange in 2014: No

Kentucky

% Uninsured, 2013: 20.4

% Uninsured, midyear 2014: 11.9

Change in uninsured (pct. pts.): -8.5

Medicaid expansion AND state/partnership exchange in 2014: Yes

Louisiana

% Uninsured, 2013: 21.7

% Uninsured, midyear 2014: 18.4

Change in uninsured (pct. pts.): -3.3

Medicaid expansion AND state/partnership exchange in 2014: No

Maine

% Uninsured, 2013: 16.1

% Uninsured, midyear 2014: 13.3

Change in uninsured (pct. pts.): -2.8

Medicaid expansion AND state/partnership exchange in 2014: No

Maryland

% Uninsured, 2013: 12.9

% Uninsured, midyear 2014: 8.4

Change in uninsured (pct. pts.): -4.5

Medicaid expansion AND state/partnership exchange in 2014: Yes

Massachusetts

% Uninsured, 2013: 4.9

% Uninsured, midyear 2014: 4.9

Change in uninsured (pct. pts.): 0.0

Medicaid expansion AND state/partnership exchange in 2014: Yes

Michigan

% Uninsured, 2013: 12.5

% Uninsured, midyear 2014: 11.9

Change in uninsured (pct. pts.): -0.6

Medicaid expansion AND state/partnership exchange in 2014: Yes

Minnesota

% Uninsured, 2013: 9.5

% Uninsured, midyear 2014: 8.8

Change in uninsured (pct. pts.): -0.7

Medicaid expansion AND state/partnership exchange in 2014: Yes

Mississippi

% Uninsured, 2013: 22.4

% Uninsured, midyear 2014: 20.6

Change in uninsured (pct. pts.): -1.8

Medicaid expansion AND state/partnership exchange in 2014: No

Missouri

% Uninsured, 2013: 15.2

% Uninsured, midyear 2014: 15.1

Change in uninsured (pct. pts.): -0.1

Medicaid expansion AND state/partnership exchange in 2014: No

Montana

% Uninsured, 2013: 20.7

% Uninsured, midyear 2014: 17.9

Change in uninsured (pct. pts.): -2.8

Medicaid expansion AND state/partnership exchange in 2014: No

Nebraska

% Uninsured, 2013: 14.5

% Uninsured, midyear 2014: 13.4

Change in uninsured (pct. pts.): -1.1

Medicaid expansion AND state/partnership exchange in 2014: No

Nevada

% Uninsured, 2013: 20.0

% Uninsured, midyear 2014: 16.0

Change in uninsured (pct. pts.): -4.0

Medicaid expansion AND state/partnership exchange in 2014: Yes

New Hampshire

% Uninsured, 2013: 13.8

% Uninsured, midyear 2014: 12.4

Change in uninsured (pct. pts.): -1.4

Medicaid expansion AND state/partnership exchange in 2014: No

New Jersey

% Uninsured, 2013: 14.9

% Uninsured, midyear 2014: 11.8

Change in uninsured (pct. pts.): -3.1

Medicaid expansion AND state/partnership exchange in 2014: No

New Mexico

% Uninsured, 2013: 20.2

% Uninsured, midyear 2014: 15.2

Change in uninsured (pct. pts.): -5.0

Medicaid expansion AND state/partnership exchange in 2014: Yes

New York

% Uninsured, 2013: 12.6

% Uninsured, midyear 2014: 10.3

Change in uninsured (pct. pts.): -2.3

Medicaid expansion AND state/partnership exchange in 2014: Yes

North Carolina

% Uninsured, 2013: 20.4

% Uninsured, midyear 2014: 16.7

Change in uninsured (pct. pts.): -3.7

Medicaid expansion AND state/partnership exchange in 2014: No

North Dakota

% Uninsured, 2013: 15.0

% Uninsured, midyear 2014: 13.0

Change in uninsured (pct. pts.): -2.0

Medicaid expansion AND state/partnership exchange in 2014: No

Ohio

% Uninsured, 2013: 13.9

% Uninsured, midyear 2014: 11.5

Change in uninsured (pct. pts.): -2.4

Medicaid expansion AND state/partnership exchange in 2014: No

Oklahoma

% Uninsured, 2013: 21.4

% Uninsured, midyear 2014: 17.5

Change in uninsured (pct. pts.): -3.9

Medicaid expansion AND state/partnership exchange in 2014: No

Oregon

% Uninsured, 2013: 19.4

% Uninsured, midyear 2014: 14.0

Change in uninsured (pct. pts.): -5.4

Medicaid expansion AND state/partnership exchange in 2014: Yes

Pennsylvania

% Uninsured, 2013: 11.0

% Uninsured, midyear 2014: 10.1

Change in uninsured (pct. pts.): -0.9

Medicaid expansion AND state/partnership exchange in 2014: No

Rhode Island

% Uninsured, 2013: 13.3

% Uninsured, midyear 2014: 9.3

Change in uninsured (pct. pts.): -4.0

Medicaid expansion AND state/partnership exchange in 2014: Yes

South Carolina

% Uninsured, 2013: 18.7

% Uninsured, midyear 2014: 16.8

Change in uninsured (pct. pts.): -1.9

Medicaid expansion AND state/partnership exchange in 2014: No

South Dakota

% Uninsured, 2013: 14.0

% Uninsured, midyear 2014: 11.3

Change in uninsured (pct. pts.): -2.7

Medicaid expansion AND state/partnership exchange in 2014: No

Tennessee

% Uninsured, 2013: 16.8

% Uninsured, midyear 2014: 14.4

Change in uninsured (pct. pts.): -2.4

Medicaid expansion AND state/partnership exchange in 2014: No

Texas

% Uninsured, 2013: 27.0

% Uninsured, midyear 2014: 24.0

Change in uninsured (pct. pts.): -3.0

Medicaid expansion AND state/partnership exchange in 2014: No

Utah

% Uninsured, 2013: 15.6

% Uninsured, midyear 2014: 15.6

Change in uninsured (pct. pts.): 0.0

Medicaid expansion AND state/partnership exchange in 2014: No

Vermont

% Uninsured, 2013: 8.9

% Uninsured, midyear 2014: 8.5

Change in uninsured (pct. pts.): -0.4

Medicaid expansion AND state/partnership exchange in 2014: Yes

Virginia

% Uninsured, 2013: 13.3

% Uninsured, midyear 2014: 13.4

Change in uninsured (pct. pts.): 0.1

Medicaid expansion AND state/partnership exchange in 2014: No

Washington

% Uninsured, 2013: 16.8

% Uninsured, midyear 2014: 10.7

Change in uninsured (pct. pts.): -6.1

Medicaid expansion AND state/partnership exchange in 2014: Yes

West Virginia

% Uninsured, 2013: 17.6

% Uninsured, midyear 2014: 11.9

Change in uninsured (pct. pts.): -5.7

Medicaid expansion AND state/partnership exchange in 2014: Yes

Wisconsin

% Uninsured, 2013: 11.7

% Uninsured, midyear 2014: 9.6

Change in uninsured (pct. pts.): -2.1

Medicaid expansion AND state/partnership exchange in 2014: No

Wyoming

% Uninsured, 2013: 16.6

% Uninsured, midyear 2014: 12.8

Change in uninsured (pct. pts.): -3.8

Medicaid expansion AND state/partnership exchange in 2014: No

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