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We derive the basic properties of seven Galactic open clusters containingCepheids and construct their period-luminosity (P-L) relations. For our clustermain-sequence fitting we extend previous Hyades-based empiricalcolor-temperature corrections to hotter stars using the Pleiades as a template.We use BVI_{C}JHK_{s} data to test the reddening law, and include metallicityeffects to perform a more comprehensive study for our clusters than priorefforts. The ratio of total to selective extinction R_V that we derive isconsistent with expectations. Assuming the LMC P-L slopes, we find <M_V> =-3.93 +/- 0.07 (statistical) +/- 0.14 (systematic) for 10-day period Cepheids,which is generally fainter than those in previous studies. Our results areconsistent with recent HST and Hipparcos parallax studies when using theWesenheit magnitudes W(VI). Uncertainties in reddening and metallicity are themajor remaining sources of error in the V-band P-L relation, but a higherprecision could be obtained with deeper optical and near-infrared clusterphotometry. We derive distances to NGC4258, the LMC, and M33 of (m - M)_0 =29.28 +/- 0.10, 18.34 +/- 0.06, and 24.55 +/- 0.28, respectively, with anadditional systematic error of 0.16 mag in the P-L relations. The distance toNGC4258 is in good agreement with the geometric distance derived from watermasers [\Delta (m - M)_0 = 0.01 +/- 0.24]; our value for M33 is less consistentwith the distance from an eclipsing binary [\Delta (m - M)_0 = 0.37 +/- 0.34];our LMC distance is moderately shorter than the adopted distance in the HST KeyProject, which formally implies an increase in the Hubble constant of 7% +/-8%.

The Distances to Open Clusters from Main-Sequence Fitting. IV. Galactic Cepheids, the LMC, and the Local Distance Scale