You can create segments of users based on their location as they were browsing your site. This location data is collected from the user's IP address, using Maxmind's geo-location database. On every pageview event we collect the user's postcode, city, country and continent so you have this data available as soon as you install Permutive.
To create a segment of users who have viewed a page in Manchester, include users with a page where the geo_info.city is Manchester
Note: To create a segment of users based on their postcode, use geo_info.postal_code and match on the first part of the postcode. For example for 'E1 1DU' I would match on 'E1'.