There isn't all that much material to illuminate the geography of the little town of Sandefjord through its history, but in the present context and by a stroke of luck, a map was drawn up in, exactly, 1801.
This map is the basis for a description of the oldest network of streets by Roar L. Tollnes, published by Sandar Historielag in 1995 in the series "Kulturminner" and available electronically at http://www.sandefjord.folkebibl.no/sandefjord/tema/kulturminner/kulturminnervar1995a.html.
The article contains descriptions, history and some analysis (in the Norwegian language) as well as a facsimile of the map itself (and a re-scan / republication of this might be useful):
A somewhat later but, one presumes, a geographically similar, Sandefjord can be inspected in a separate article by Tollnes (see http://www.sandefjord.folkebibl.no/sandefjord/tema/kulturminner/kulturminnervar1995.html) on the boundaries and extensions of Sandefjord:
And later developments:
The last maps shows the boundaries of the town at various times of its history until it was (re-) absorbed by rural municipality of Sandar from which it had originally emerged.
As an experiment: a Google map showing the location of some of the buildings from 1801 in the context of the modern town centre:
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