This guide will help direct you to resources for researching and creating your Roman city. Please note that this guide is not comprehensive; there are more resources out there that you may find and want to use in your research. Updated Spring 2020.
A comprehensive database of biographical information on people from throughout history, around the world, and across all disciplines and subject areas.
The German Archaeological Institute sponsors dozens of urban excavation projects around the Roman Mediterranean. Most sites have lots of information about urban history.
Vici.org is the archaeological atlas of classical antiquity. It is a community driven archaeological map, inspired by and modeled after Wikipedia. Although it is crowd-sourced it has fairly accurate archaeological images and data
A web-based GIS for the ancient world with most of they key layers and places already built in. It should be good for mapping various geographic and topographical features around your city.
The DARMC is a GIS that reveals different layers of data about places in the Roman world. It can tell you where a temple is or water source or road or fort etc.
This is a link to the Stanford Geospatial Network Model of the Roman World, which allows you to chart travel times between ancient sites in the Mediterranean.
The Barrington Atlas of the Greek and Roman World was published in 2000 as part of an international effort to create a comprehensive map and a directory of all ancient places mentioned in sources and a selection of important archaeological sites. This map shows all the known settlements in the Roman world in detail for all regions.
Pleiades is a website that has geo-located data for hundreds of settlements in the ancient world. Pleiades publishes authoritative information about ancient places and spaces, providing unique services for finding, displaying, and reusing that information under open license.