Presenting detailed statistics illustrating trends and the numerical status of one-teacher schools, this U.S. Office of Education bulletin spans a 30-year period describing, by states, the overall decreases in the number of 1-teacher schools, their proportional relationship to all public schools and teachers, and the number of students attending them. Specifically, this report includes the following tabular data: public school consolidation trends revealed by statistics of 1-teacher schools and pupil transportation for the U.S. as a whole, 1918-48; number of 1-teacher schools by years specified and by states, 1918-48; percentage of 1-teacher schools in 1917-18 remaining, by years specified and by states; percentage ratios of 1-teacher schools to all public schools by years indicated and by states, 1918-48; percentage ratios of teachers in 1-teacher schools to teachers in all public schools by years indicated and by states, 1918-48; number and percentage of all public school pupils attending 1-teacher, 2-teacher, and 3-teacher schools in certain states, 1947-48. The data presented here indicate that: of the remaining 75,000 1-teacher schools, most are small in building, enrollment, and community served; while generally the 1-teacher school is vanishing, in nearly all the northcentral prairie region it accounts for nearly 75% of that region's public schools, 25% of its teachers, and 20% of its students. (JC)