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A catalogue of 239 ultra-compact HII regions (UCHIIs) found in the CORNISHsurvey at 5 GHz and 1.5" resolution in the region $10^{\circ} < l < 65^{\circ},~|b| < 1^{\circ}$ is presented. This is the largest complete and well-selectedsample of UCHIIs to date and provides the opportunity to explore the global andindividual properties of this key state in massive star formation at multiplewavelengths. The nature of the candidates was validated, based on observationalproperties and calculated spectral indices, and the analysis is presented inthis work. The physical sizes, luminosities and other physical properties werecomputed by utilising literature distances or calculating the distanceswhenever a value was not available. The near- and mid-infrared extended sourcefluxes were measured and the extinctions towards the UCHIIs were computed. Thenew results were combined with available data at longer wavelengths and thespectral energy distributions (SEDs) were reconstructed for 177 UCHIIs. Thebolometric luminosities obtained from SED fitting are presented. By comparingthe radio flux densities to previous observational epochs, we find about 5% ofthe sources appear to be time variable. This first high-resolution area surveyof the Galactic plane shows that the total number of UCHIIs in the Galaxy is ~750 - a factor of 3-4 fewer than found in previous large area radio surveys. Itwill form the basis for future tests of models of massive star formation.

The Coordinated Radio and Infrared Survey for High-Mass Star Formation III. A catalogue of northern ultra-compact H II regions