This report was produced by RTI International for BJS under award number 2017-MU-MU-K048. It offers programmers and statisticians guidance on how to use small area estimation (SAE) techniques to develop crime estimates with data from the National Crime Victimization Survey (NCVS) and the Summary Reporting System (SRS) of the FBI’s Uniform Crime Reporting (UCR) Program. It also details how to determine the final predictors for deriving the variance-covariance matrix in SAE models and how to use the SAE functions in R to compute final subnational estimates for a set of outcomes. Estimates cover victimization and prevalence rates of common crime types. Supplemental files referenced in this report are available in its companion report, Constructing and Disseminating Small Area Estimates from the National Crime Victimization Survey, 2007–2018, or will be provided to restricted-use data users upon approval with the U.S. Census Bureau.