ObjectiveTo estimate the point prevalence of pneumonia and malnutrition and explore associations with household socioeconomic factors.DesignCommunity-based cross-sectional study conducted in January–June 2021 among a random sample of households across all villages in the study area.SettingKiyawa Local Government Area, Jigawa state, Nigeria.ParticipantsChildren aged 0–59 months who were permanent residents in Kiyawa and present at home at the time of the survey.Main outcome measuresPneumonia (non-severe and severe) defined using WHO criteria (2014 revision) in children aged 0–59 months. Malnutrition (moderate and severe) defined using mid-upper arm circumference in children aged 6–59 months.Results9171 children were assessed, with a mean age of 24.8 months (SD=15.8); 48.7% were girls. Overall pneumonia (severe or non-severe) point prevalence was 1.3% (n=121/9171); 0.6% (n=55/9171) had severe pneumonia. Using an alternate definition that did not rely on caregiver-reported cough/difficult breathing revealed higher pneumonia prevalence (n=258, 2.8%, 0.6% severe, 2.2% non-severe). Access to any toilet facility was associated with lower odds of pneumonia (aOR: 0.56; 95% CI: 0.31 to 1.01). The prevalence of malnutrition (moderate or severe) was 15.6% (n=1239/7954) with 4.1% (n=329/7954) were severely malnourished. Being older (aOR: 0.22; 95% CI: 0.17 to 0.27), male (aOR: 0.77; 95% CI: 0.66 to 0.91) and having head of compound a business owner or professional (vs subsistence farmer, aOR 0.71; 95% CI: 0.56 to 0.90) were associated with lower odds of malnutrition.ConclusionsIn this large, representative community-based survey, there was a considerable pneumonia and malnutrition morbidity burden. We noted challenges in the diagnosis of Integrated Management of Childhood Illness-defined pneumonia in this context.