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Abstract. A circular city builds upon the principles of circular economy, which keyconcepts of reduce, reuse, recycle, and recover lead to a coupling ofresources: products and by-products of one production process become theinput of another one, often in local vicinity. However, sources, types andavailable quantities of underutilised resources in cities are currently notwell documented. Therefore, there is a missing link in the information flowof the circular city between potential users and site-specific data. Toclose this gap, this study introduces the concept of a site resourceinventory in conjunction with a new information model that can manage thedata needed for advancing the circular city. A core taxonomy of terms isestablished as the foundation for the information model: the circulareconomy is defined as a network of circular economy entities which areregarded as black boxes and connected by their material and energy inputsand outputs. This study proposes a site resource inventory, which is acollection of infrastructural and building-specific parameters that assessthe suitability of urban sites for a specific circular economy entity. Aninformation model is developed to manage the data that allows the entitiesto effectively organise the allocation and use of resources within thecircular city and its material and energy flows. The application of thisinformation model was demonstrated by comparing the demand and availabilityof required alternative resources (e.g. greywater) at a hypothetical sitecomprising a commercial aquaponic facility (synergistic coupling of fish andvegetables production) and a residential building. For the implementation ofthe information model a proposal is made which uses the publicly availablegeodata infrastructure of OpenStreetMap and adopts its tag system tooperationalise the integration of circular economy data by introducing newtags. A site resource inventory has the potential to bring togetherinformation needs and it is thus intended to support companies when makingtheir business location decisions or to support local authorities in theplanning process.