The arch of the foot provides an elastic, springy connection between the forefoot and hindfoot. The aim of this study is to assess the plantar arch index and prevalence of flat feet among indigenes of Ikwerre local government area, Rivers State aged 18-60. The study is a cross-sectional study using random sampling technique to select participants., Staheli’s index was used to calculate the plantar arch index. Statistical analysis was done using SPSS version 25.0. A total of 107 males (53.5%) and 93 females (46.5%) were assessed to determine whether there were statistically significant gender differences in foot length, midfoot breadth, heel breadth, and arch index. The results show that males had a slightly higher mean foot length (25.17 cm) compared to females (24.60 cm). The t-test value of 1.99 and a p-value of 0.048 indicate that this difference is statistically significant at p < 0.05. This suggests the presence of sexual dimorphism in foot length, meaning that men in this population generally have longer feet than women. For midfoot breadth, males recorded a mean of 5.03 cm, while females had a mean of 4.89 cm. The t-test value (0.95) and p-value (0.34) show that this difference is not statistically significant, implying that both genders have similar midfoot widths. Regarding heel breadth, the mean values for males (7.96 cm) and females (7.93 cm) were nearly identical. The t-test value (0.37) and p-value (0.97) further confirm that there is no significant difference between males and females in heel width. Similarly, the arch index had a mean value of 0.83 for males and 0.80 for females. With a t-test value of 0.67 and a p-value of 0.49, the result shows no significant difference between genders. This suggests that both males and females in this population share similar arch structures and proportions. In summary, the only statistically significant gender difference observed was in foot length, with males exhibiting longer feet than females. However, no significant differences were found in mid foot breadth, heel breadth, or arch index. This indicates that while men generally have longer feet, the overall structural proportions and arch configurations of the feet are similar across both sexes in the studied population