This is a list of properties and historic districts on the National Register of Historic Places in the Portland neighborhood of Louisville, Kentucky (roughly bounded by the Ohio River on the north; N. 10th St. to the east; W. Market St. to the south; and I-264 and the Shawnee Golf Course to the west. Latitude and longitude coordinates of the 32 sites listed on this page may be displayed in a map or exported in several formats by clicking on one of the links in the box to the right.
^The latitude and longitude information provided in this table was derived originally from the National Register Information System, which has been found to be fairly accurate for about 99% of listings. For about 1% of NRIS original coordinates, experience has shown that one or both coordinates are typos or otherwise extremely far off; some corrections may have been made. A more subtle problem causes many locations to be off by up to 150 yards, depending on location in the country: most NRIS coordinates were derived from tracing out latitude and longitudes off of USGS topographical quadrant maps created under the North American Datum of 1927, which differs from the current, highly accurate WGS84 GPS system used by most on-line maps. Chicago is about right, but NRIS longitudes in Washington are higher by about 4.5 seconds, and are lower by about 2.0 seconds in Maine. Latitudes differ by about 1.0 second in Florida. Some locations in this table may have been corrected to current GPS standards.