The independent isomeric yield ratios of ^87m,gY produced from the ⁹³Nb(γ,α2n) and ^natZr(γ, pxn) reactions with the end-point bremsstrahlung energy of 45–70MeV have been determined by an off-line γ-ray spectrometric technique using 100MeV electron linac at the Pohang accelerator laboratory, Korea. The isomeric yield ratios of ^87m,gY were also determined from the ^natZr(p, αxn) and the ⁸⁹Y(p, p2n) reactions with E_P = 15–45MeV as well as those from the ⁸⁹Y(α, α2n) reaction with E_α = 32–43MeV using the MC-50 cyclotron at the Korea Institute of Radiological and Medical Science, Korea. The isomeric yield ratios of ^87m,gY from the present work in the ⁹³Nb(γ,α2n), ^natZr(γ, pxn), ^natZr(p, αxn), ⁸⁹Y(p,p2n), and ⁸⁹Y(α, α2n) reactions were compared with those of the literature data in the ⁸⁵Rb(α, 2n), the ^86,87,88Sr(d, xn), ⁸⁹Y(n, 3n), and the ⁸⁹Y(γ, 2n) reactions to examine the role of target, projectiles, and ejectiles through compound nucleus excitation energy and input angular momentum. The isomeric yield ratios of ^87m,gY in the above eleven reactions were also calculated using the computer code TALYS 1.4 and compared with the experimental data. The different behaviors between photon- and neutron-induced reactions and charged-particle–induced reactions are discussed from the viewpoint of compound and non-compound (pre-equilibrium) process.