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The gastrointestinal environment is home to a massive diversity of diet-, host-, and microbiota-derived small molecules, collectively sensed by a remarkable variety of cells. To explore the cellular and spatial organization of sensation, we use MERFISH to profile receptor expression across 2.1 million cells in multiple regions of the murine gut under specific-pathogen-free (SPF) and germ-free (GF) conditions. This atlas reveals expected and previously unidentified cell types-including a candidate murine homolog of human BEST4⁺ enterocytes-demonstrates cell-type regional specialization, discovers extensive location-dependent spatial fine-tuning in mucosal cell expression, and suggests cell-type-specific mediators of the effects of microbiota-derived small molecules. Additionally, this atlas reveals that, aside from immune cell abundance, many aspects of the murine gut are host-intrinsic and modified only modestly in the absence of a microbiota. Collectively, this atlas provides a valuable resource for understanding the cellular and spatial organization underlying small-molecule sensation in the gut.