Radiation therapy (RT) is an effective modality for the treatment of squamous cell carcinomas of the penis. The NCCN recommends consideration of primary radiation for penile preservation and surgically unresectable tumors, and as adjuvant therapy for positive margins, bulky groin nodes or pelvic nodes. We hypothesize that radiation therapy is under-utilized. We performed a population based analysis to evaluate the usage and predictors for usage of radiation therapy in penile cancer from 2007-2013. We used the Surveillance, Epidemiology and End Results (SEER) database to identify men diagnosed with squamous cell carcinoma of the penis from 2007 – 2013. We extracted information on patient demographics, tumor characteristics, and initial treatment course. Patients were grouped as early stage (T1-T2N0), locally advanced (T3-T4N0), node positive (T1xN1-3) and metastatic. AJCC 6th edition staging was used as some factors necessary for AJCC 7th edition were not available. Treatment modality was described as none, primary surgery, primary radiation or both. We used linear regression model to test for predictors of usage of adjuvant radiation in node positive patients. We identified 2200 men age diagnosed with penile squamous cell cancer between 2007 and 2013. Of these, 66.4% had early stage, 10.7% had locally advanced, 15.5% had node positive, 3.2% had metastatic and 4.3% had unknown stage cancer. Among patient with early stage cancer, radiation therapy was used in 14 patients (1.0%) and post-operative radiation in an additional 45 patients (3.1%). The vast majority of these were treated with external beam radiation, with brachytherapy used in 4 cases (6.8%). Among 340 patients with node positive cancer, 62.1% received surgery alone, 5.6% radiation alone, 21.8% surgery with adjuvant radiation, and 10.6% neither surgery nor radiation. Of patients who had surgery, 26.0% had adjuvant radiation. Limiting patients to multiple lymph nodes, 31.2% received adjuvant radiation. On univariate analysis, nodal stage (N1 vs N2-3) was predictive of receipt of adjuvant radiation (p = 0.02), while there was a trend for higher T-stage (T3/T4 vs T1/T2) (p=0.08) and history of prior malignancy (p=0.06). On multivariate analysis, only nodal stage was predictive of use of adjuvant radiation (HR 1.94, p=0.03). A small percentage of patient who are eligible for primary or adjuvant RT in the United States receive this treatment. Further work should be done to assess barriers to use of radiation in patients with penile cancer.