The purposes of the study were to determine (a) the ability of two spontaneous language measures, mean length of utterance in morphemes (MLU-m) and number of different words (NDW), to identify African American preschool children at low and high levels of language ability; (b) whether child chronological age was related to the performance of either group; and (c) the relationship between maternal education and the performance of children on MLU-m, NDW, and on the Expressive Communication (EC) subscale of the Preschool Language Scale-3. Analyses revealed that children with low language abilities performed lower on the language sampling measures than did those with high language abilities. Using MLU-m and NDW successfully classified 72.1% children with low language abilities and 75.4% children with high language abilities. Children's MLU-m and NDW were positively related with age. Children differed in their expressive language measures related to maternal education levels. (Contains 2 tables.)