Several works have been devoted to the computation of exciton states of noncovalently bound azobenzene aggregates from first principles. The exciton states of the simplest aggregate, a molecular dimer, have been investigated by means of quantum chemical calculations, employing a variety of electronic structure methods, in our previous works. The nature of the exciton states has been analyzed with a help of natural transition orbital (NTO) and transition density matrix (TDM) analyses. Larger aggregates -linear oligomers including up to six azobenzenes as well as a pentamer mimicking a SAM -have been studied by Utecht et al. by means of time-dependent density functional theory (TD-DFT) calculations with the B3LYP density functional approximation. The optical properties of ideal (having geometrically identical monomers), infinite SAMs treated as periodic systems have been investigated by Cocchi et al. by solving the Bethe-Salpeter equation (BSE) on top of Green's function many-body perturbation theory (GW ) calculations. Recently, Kshirsagar et al. studied optical absorption of azobenzene-functionalized metal-organic frameworks using the BSE/GW approach. Furthermore, several works have addressed exciton formation in covalently linked multiazobenzenes. Here, we expand the previous studies by treating large 1D and 2D clusters of azobenzenes (up to 18 molecules) by means of first-principles quantum chemical methods such as time-dependent long-range corrected density functional theory (TD-lc-DFT) and ab initio configuration interaction singles (CIS). Nowadays, thanks to the progress in computational resources, these methods can be applied to large molecules / clusters of molecules, and, importantly, they do not suffer from the so-called charge transfer (CT) problem of TD-DFT. Furthermore, we analyze the nature of the exciton states using the TDM analysis, which allows us to judge on exciton delocalization pattern and importance of charge transfer contributions for the studied azobenzene aggregates. We also perform BSE/GW calculations for a selected chain model to reveal the effect of infinite, periodic arrangement on azobenzene optical absorption.