We have obtained rotationally resolved pulsed filed ionization photoelectron (PFI-PE) spectra of NO in the energy range of 9.2-16.8 eV, covering ionization transitions of NO+(X (1)Sigma(+),v(+)=0-32,J(+))<-- NO(X (2)Pi(3/2,1/2),v"=0,J"). The PFI-PE bands for NO+(X (1)Sigma(+),v(+)=6-32) obtained here represent the first rotationally resolved spectroscopic data for these states. The simulation using the Buckingham-Orr-Sichel model provides accurate molecular constants for NO+(X (1)Sigma(+),v(+)=0-32), including ionization energies, vibrational constants (omega(e)(+)=2 382.997 +/- 0.122 cm(-1), omega(e)(+)chi(e)(+)=17.437 84 +/- 0.000 90 cm(-1), omega(e)(+)y(e)(+)=0.063 209 5 +/- 3.2x10(-6) cm(-1), and omega(e)(+)z(e)(+)=-0.001 400 0 +/- 7.2x10(-8) cm(-1)), and rotational constants (B-e(+)=1.996 608 +/- 0.006 259 cm(-1), alpha(e)(+)=0.020 103 +/- 6.3x10(-5) cm(-1), and gamma(e)(+)=-(7.22 +/- 2.26)x10(-6) cm(-1)). For v(+)=0-15, the rotational branches are Delta J=J(+)-J"=+/- 1/2, +/- 3/2, +/- 5/2, +/-7/2, and +/- 9/2, which correspond to the formation of photoelectron angular momentum states l=0, 1, 2, and 3. The Delta J=+/- 1/2, +/- 3/2, +/- 5/2, +/- 7/2, +/- 9/2, and +/-11/2 rotational branches are observed in the spectra for v(+)=16-32, revealing the production of continuum photoelectron states l=0, 1, 2, 3, and 4. The maximum Delta J value and intensities for high Delta J rotational branches are found to generally increase as v(+) is increased in the range of 0-32. This observation is attributed to an increase in inelastic cross sections for collisions between the outgoing photoelectron and the nonspherical molecular ion core as the bond distance for NO+ is increased. Thus, this observation can be taken as strong support for the electron-molecular-ion-core scattering model for angular momentum and energy exchanges in the threshold photoionization of NO.