Food pantries provide free food to individuals at nutritional risk given lack of available foods. Frequent use of food pantries is associated with higher dietary quality; however, neither the nutrient contributions of food pantries to participant diets, nor their relationship with household food security are known. This cross-sectional analysis used secondary data from rural food pantry participants, including sociodemographic characteristics, household food security, and 24-hour recalls. Mean intakes of selected food groups and nutrients from food pantries, supermarkets, other stores and restaurants, and other were compared by one-way analysis of covariance (ANCOVA). Interaction effects of household food security with food sources were evaluated by two-way ANCOVA. About 40% of participants’ dietary intake came from food pantries. Mean intakes of fibre (P<0.0001), sodium (P<0.0001), fruit (P<0.0001), grains (P<0.0001), and oils (P<0.0001) were higher from food pantries compared with all other sources, as were calcium (P=0.004), vitamin D (P<0.0001) and potassium (P<0.0001) from food pantries compared to two other sources. Percent total energy intake (%TEI) from added sugars (P<0.0001) and saturated fat (P<0.0001) were higher from supermarkets than most other sources. Significant interaction effects were observed between food sources and household food security for vegetables (P=0.01), sodium (P=0.01), and %TEI from saturated fat (P=0.004), with food insecure participants having significantly higher intakes from food pantry and/or supermarket compared to all other sources. Future interventions may incorporate these findings by providing education on purchasing and preparing healthy meals on limited budgets, to complement foods received from pantries, and by reducing sodium in pantry environments.