For commercial establishments everyone and her brother now offer WiFi. Not the government, at least not that I am aware of. But our British cousins offer it, specifically "GovWifi", as described in this post at the UK blog:
GovWifi, developed and managed by Government Digital Service (GDS), is a single wifi login which can be simply and cheaply installed by government departments over their existing infrastructure.Anyone who registers with GovWifi will have access to wifi at any participating public sector location. It’s available to civil servants, consultants and visitors to government departments.It’s been designed to replace user and guest wifi with a single secure wifi connection.Users register once. After that, they’ll automatically connect to the GovWifi network. They don’t need to remember a password or sign in to different networks when they move between buildings.So why can't the US government do this?