  Benchmark stars with known angular diameters are key to calibrating
interferometric observations. With the advent of optical interferometry, there
is a need for suitably bright, well-vetted calibrator stars over a large
portion of the sky. We present a catalog of uniformly computed angular
diameters for 1523 stars in the northern hemisphere brighter than V = 6 and
with declinations $-15^\circ < \delta < 82^\circ$. The median angular stellar
diameter is 0.527 mas. The list has been carefully cleansed of all known binary
and multiple stellar systems. We derive the angular diameters for each of the
stars by fitting spectral templates to the observed spectral energy
distributions (SEDs) from literature fluxes. We compare these derived angular
diameters against those measured by optical interferometry for 75 of the stars,
as well as to 176 diameter estimates from previous calibrator catalogs, finding
in general excellent agreement. The final catalog includes our goodness-of-fit
metrics as well as an online atlas of our SED fits. The catalog presented here
permits selection of the best calibrator stars for current and future
visible-light interferometric observations.
