Objectives: to evaluate prenatal care in Primary Care by identifying the aspects that influence structural and operational adequacy. Methods: evaluation research with analysis of 4,059 municipalities that joined the 2nd cycle of the Program for Improving Access and Quality in Primary Care in 2013-2014. The evaluative model composed of 19 indicators grouped in structural aspects and operational aspects dimensions was validated in a consensus conference. Data analysis was descriptive, with the issuance of value judgment. Results: in structural aspects, 32.6% of the municipalities presented adequacy, whilst in operational ones, only 24.1%. In the general prenatal evaluation, less than a quarter (24.6%) of the municipalities was adequate, those with up to 10 thousand inhabitants had a higher percentage of adequacy (41.6%). The South region presented adequacy of 33.8%, considering all sizes. Conclusions: most municipalities presented low adequacy in prenatal care, with better performance of structural aspects. Smaller municipalities presented better results in all analyzed items. Structural aspects and general evaluation of prenatal care are highlighted in the South region. Adequate attention to prenatal care needs to be comprehensive and equitable, with the strengthening of regional networks geared towards social inclusion.