Excerpts from the report Introduction: The investigation of migration and its relation to county government finance is a part of a broad study of migration and resettlement problems in the Pacific Coast States. The study was initiated by the Bureau of Agricultural Economics in 1939. Other phases deal with such matters as sources and magnitude of migration, adjustments made by migrants in settling, employment opportunities, and income obtained. In this report of one phase of the study, attention is focused on the impact of a large population increase through migration on the disbursements and revenues of California counties in general, with particular emphasis on the experience of two valley counties - Kern and Yuba. It is admittedly impossible to assign an exact dollar value to that share of the increase in county disbursements which can be specifically traced to interstate migration. On the other hand, there is a real need for avoiding vague generalities and purely subjective description in connection with such a problem. The approximations that follow are made at the risk of presenting quantitative material that might be used without the necessary qualifications, but with the hope that they will facilitate more careful analysis of a perplexing problem.