Using Vanderbilt University Medical Center’s electronic health record (EHR), we tested the hypothesis that we could identify patients with resistant hypertension (RH) and patterns of treatment of RH in a real-world clinical setting. Patients were identified as having RH if they had blood pressure (BP) >140/90 mmHg despite concurrent treatment with three different classes of antihypertensive medications including a thiazide diuretic or amlodipine or similar dihydropyridine (DHP) calcium channel blocker (CCB) or if they were treated with four antihypertensive medications including the same classes. Secondary causes and chronic kidney disease were excluded. Among 186,015 European American (EA) and 33,576 African American (AA) hypertensive patients, 13,541 (7.3%) and 3,541 (10.5%) had RH, respectively. AA with RH were younger, heavier, more often female, had a higher incidence of type 2 diabetes, and had higher systolic and diastolic BPs than EA with RH. AA with RH were more likely than EA to be treated with vasodilators, DHP CCB, and α2-agonists. EA were more likely to be treated with angiotensin receptor blockers, renin inhibitors, and beta-blockers. Mineralocorticoid receptor (MR) antagonists were used in both EA and AA patients and use was increased in patients treated with > four antihypertensive medications compared to patients treated with three (2.6% vs 12.4% in EA, p<0.001; 2.8% vs 12.3% in AA, p<0.001). The number of patients treated with an MR antagonist increased to 36.6% in EA and 40.3% in AA over a mean follow-up period of 7.4 and 8.7 years, respectively. Our results demonstrate that clinicians use different classes of medication to treat RH in AA and EA.