A study was conducted to examine differences between Mexican Americans and Anglos on four measures of network morphology. Data were drawn from a sample of single mothers in San Jose, California. The results revealed that after controlling for socioeconomic status (SES), ethnic differences remained significant for the total size of the network and for the density of the friend network but not for the proportion of kin in the network. Within the Mexican American subsample, after adjustment for SES, generation was related to significant and nonlinear differences in the proportion of kin and the magnitude of the friend network.