massive 2079 page Doc from 2014 called "Route of Santiago de Compostela - Maps of inscribed property" - page 1451 of the pdf, code 1709.
BTW - for those members of the group valiantly compiling the map data for all the TWHS sites (kudos to all of you!!): the Spanish rock art site is not, after all, the most mind-boggling serial site of all. The originial Route of Santiago seems to contain not only the route itself, but also a massive 1912 individual monuments (churches, houses, townscapes, etc etc - not necessarily contiguous to the Route!) as per that doc. Page 157 clusters them geographically as follows:
I. Aragón: Huesca y Zaragoza - Code 1 - 148
II. Navarra 149 - 526
III. La Rioja 527 - 610
IV. Castilla y León 1: Burgos 979 - 1 315
V. Castilla y León 2: Palencia, León oriental y León capital 1 316 - 1 672
VI. Castilla y León 3: León occidental 1 673 - 1 912
VII. Galicia: Lugo y A Coruña 611 - 978
Coordinates are given for each of them (or rather: there are maps for each of them, from which one can imply the coordinates) - but I guess we won't find any volunteers to compile all this...
The UNESCO website BTW seems to list only the coordinates of the recently-added Coastal routes.