Background: This study was done to determine the differences in mean auricular lengths, auricular widths and earlobe lengths of males and females with increase in age, prevalence of pendulous and non-pendulous earlobes and Darwinian tubercle in the Igbo and Yoruba ethnic groups of the adult Nigerian population.Materials and methods: These measurements were obtained from 182 females and 118 males from Igbo ethnic group and 95 females and 105 males of the Yoruba ethnic group between ages 18-68 years. Digital vernier calliper was used to measure the different parameters in each individual with 95% confidence interval of the statistic. Results:The result showed generally, that the auricular length and earlobe lengths increased with an increase in age while the auricular width increased irrespective of the advancement in age. Darwinian tubercle in Igbos was 68(22.67%), Prevalence of pendulous earlobe was 157(52.33%) and non-pendulous earlobe 143(47.67%) while in Yorubas Darwinian tubercle was 48(24.0%). Prevalence of pendulous earlobe 132(66.0%) and non-pendulous earlobe was 68(34.0%). The auricles are asymmetrical and continue to grow throughout life in both sexes. Conclusion:Care should be taken in noting the ages and sex of the individuals before surgical practices is been carried out for each auricle.