We report the statistical physical properties of the C^18^O(J=1-0) clumps present in a prominent cluster-forming region, Cygnus X, using the data set obtained by the Nobeyama 45m radio telescope. This survey covers 9deg^2^ of the northern and southern regions of Cygnus X, and, in total, 174 C^18^O clumps are identified using the dendrogram method. Assuming a distance of 1.4kpc, these clumps have radii of 0.2-1pc, velocity dispersions of 140M_{sun}, which are consistent with the low- and intermediate-mass parts of the Kroupa's initial mass function. The spectral index of the star-forming clumps >140M{sun} is consistent with that of the starless clumps ranging from 55-140M{sun}, suggesting that the latter will evolve into star-forming clumps while retaining the gas accretion. Assuming a typical star-formation efficiency of molecular clumps (10%), about 10 C^18^O clumps having a gas mass of >10^3^M{sun}_ will evolve into open clusters containing one or more OB stars.

Cone search capability for table J/ApJ/883/156/table1 (C^18^O core catalog of the Cygnus-X survey)