County Data Repository

Reading the tables:

Percentages are rounded to whole numbers (<1% is a nonzero share that rounds below 1%), so the shares in a group may not add to exactly 100%. The State column shows — whenever your selection spans more than one state.

Birth-certificate indicators: these come from National Vital Statistics System birth records, used under rules that protect the privacy of individual births (the † and * in the legend above). A figure is withheld when it is based on fewer than 10 births, and occasionally a related figure is withheld alongside it so that the first stays protected. Combining multiple counties may result in withheld data even if some counties in the selection have publishable data. This tool only shows combined birth-certificate data when the data is publishable for at least 95% of the births in your selection. Otherwise, the Selected Counties cell shows †, and hovering it gives the share the figure would have covered.

Shares within a group: in the health insurance, mother's age, and race and ethnicity groups, each row is judged on its own. It only appears when the counties behind it account for at least 95% of the births in your selection, and is withheld when they do not. So a group can show some rows and withhold others, and the shares you can see will not add to 100% because some rows are withheld. Two rows in the same group are not necessarily built from the identical set of counties, but each one shown covers at least 95% of the births in your selection. The smaller categories (all other or unknown payer and mothers under 20) are withheld in more counties than the large ones, so expect to see them withheld here more often, even when selecting larger counties.

All other or unknown payer covers every source of payment for the delivery other than the three categories shown alongside it (private plan, Medicaid/CHIP, and no insurance/uninsured): Veterans Affairs, Tricare or other military health care; the Indian Health Service; other government programs; other sources; and birth certificates where the payer was not stated.

Counties with no birth-certificate data: a few county definitions have changed since the birth records were coded, so the records cannot be matched to today's boundaries and every birth-certificate row shows —. Connecticut: this affects all nine planning regions, which replaced the state's eight former counties (Connecticut's state figures are unaffected). Alaska: the Chugach and Copper River Census Areas were created when the former Valdez–Cordova Census Area was split. Hawaii: Kalawao County has no birth records of its own. Selecting one of these areas alongside ordinary counties marks the birth-certificate rows §, because the combined figure covers the other counties only.

Number of births that took place within the area: 0 means no births were recorded as occurring there. Counties where 1–9 births occurred show †. A combined total that has to leave such a county out is shown with §.

Combined values: figures are weighted by size rather than averaged evenly. For example, a county of 500,000 people counts for much more than one of 5,000. The Percent of counties rows are the exception: there, each county you select counts once, whatever its size.

Citation: Rural Maternal Health Data Support and Analysis (RMHD). County Data Repository. https://www.ruralmaternaldata.org/. Underlying sources are listed below.