University of Albany's Center for Technology in Government has a nice list of journals dedicated to digital government research:
- Electronic Journal of eGovernment (EJEG)
- International Journal of Electronic Government Research
- Journal of E-government
- The Information Polity
CTG also highlights Communications of the ACM, Government Information Quarterly, Information Technology & People, Journal of Government Information, Social Science Computer Review, and The Information Society as good general journals that carry occasional e-gov-relevant research.