We investigated the locality of electron correlation in organic systems through Mutual Information (MI) indices between atomic orbitals and full atomic systems. This is an important precursor for the development of quantum chemical methods towards extensive chemical systems. On the one hand, we confirmed the notion of locality in dipeptide systems through the observation that quantum correlations decay exponentially with the interatomic distance between atom pairs in dipeptides. On the other hand, we also observed that I paq AB indices respect chemical notions of bonding, with a hierarchy in I paq AB , highest in double bonds, followed by single bonds, and lowest in non-bonded interactions, highlighting the varying strengths of these chemical interactions. We also demonstrated that selfconsistent DFT and HF methods effectively capture electronic correlation trends compared to highquality and computationally expensive DMRG results, reconfirming the applicability of these methods in the description of weakly correlated correlation and near-equilibrium geometries like dipeptides. Although DFT and HF methods systematically undervalue DMRG results with a factor 1.16, the general and relative trends are robustly reproduced by these computationally inexpensive methods.